No Girls on the Internet

The phrase originates from the godawful awesome Early Days of the Internet, where it was seen as the dominion of basement-dwelling, generally male nerds. Most of these have since migrated to /tg/, so the meme fits perfectly.

Interpretations

Memes, being living breathing documents, are constantly evolving. Consequently, 'No Girls on the Internet' has gone through several different stages during its multidecade evolution.

Dawn of the internet

This view is a literal interpretation and is considered the origin of the meme. Men are generally early adopters of any technology or social structure. As a result, the early days of the internet contained an extremely small number of women. The phrase was therefore a objective observation of the state of the internet population.

Vidya

As online games became more popular in the 90s, people began to discover that a good way to get free shit was to pretend to be female. Various idiots would give clan status, items, game currency, and other valuables to anything with a uterus in the hope that they would receive female attention. The meme evolved into a phrase to protect guildmates and friends from giving away their hard earned items to random fraudsters or from mistakenly engaging in ERP with other dudes. Most importantly, it was designed to protect lonely friends from ultimate shame when their "internet girlfriends" were inevitably revealed to be some dude with a confused sexuality.

Tits or GTFO

As the internet became more mainstream during the early and mid 00s, it was revealed that women DID use the internet. Unsure of whether a self proclaimed female was legitimate or not, people started to demand proof in the form of photos. These women discovered that they could get alot of attention simply for being female. This phenomenon manifested on 4chan as the boards were spammed with thread after thread of camwhores or trolls looking for attention. The spam began to displace high quality threads much like how carbon-monoxide displaces oxygen. Suffocating oldfags attempted to discourage the attention whore cancer by abrasively demanding that any girls display their tits or GTFO. This attempt failed miserably as the camwhores complied with the request and thus made the spam threads more popular than ever before.

Final Form

Newfags began to argue with oldfags over the hostility and abrasiveness towards the camwhores. Soon women began to exploit their possession of uteruses (uteri?) to give their posts and arguments greater weight in the eyes of legions of newfags. As a forum that despises identities, 4chan decided to fight back against the cancer of female shit posters who started every argument with "Im a girl and i think that...."

The result is one of the best posts ever made to 4chan:

...and this is why many feminists complain about 4chan, because this post would argue that saying "I'm a female and have a problem with...

...your chauvinistic sex jokes"

...your constant impositions of phallicism and sex fetishes" ...the enormous amount of degradation of females, female genetalia, and female breasts as a form of swearing and talking" ...the egregious amount of masculinism" ...the fact that when a female public speaker tries to bring this up at a university, there's a chance someone will threaten to shoot them" ...the fact that your reaction to women enjoying their empowerment is to use scumbag level social engineering and add on to the amount of pressure and discomfort women and girls feel about their bodies because of society"

Hell, the person writing this is dude who has a problem with the purposeful misogyny and sorrowful seeing the unintentional tendencies of speech and illustration that degrade women, and for this reason doesn't deem going anywhere beyond 1d4chan wise.... especially since there are a lot pro-feminist articles on here, all over the place. But seriously, social engineering that involves forcing someone to post nude pics or leave is just wrong, and it's really cruel because a that kind of shit happens in the real world too.