Manga
Manga are like comics, except Japanese, and read from right to left. Alongside anime, manga are one of the stereotypical weeaboo's favourite things. It is very common for popular manga series to receive animated adaptations and vice versa, prompting endless debate amongst fans about which version is better. Manga are sometimes referred to as mangos by both detractors and fans.
Notable Manga
The portion of /tg/ that doesn't immediately shout "weeaboo" whenever anything asian is mentioned generally agrees that Berserk (at least, early Berserk) and Blame! are very good reads. Although Blame! might be more accurately described as a "look" since it has very little dialogue.