Biovore
Created by the Tyranids and Games Workshop to continue their quest to scar the minds of the 40k fanbase and Neckbeards alike with pseudo-sexual xenos references, the Biovore both makes people uncomfortable and generates endless amounts of derp.
The facts: The Biovore was created by the Tyranids to be a living artillery. With a huge living cannon mounted on their backs, they grow spore mines deep inside themselves and then launch them through a powerful muscle spasm from their mind through their cannon at the enemy. The truth: Biovores reach orgasm in order to find weird looking spore-seeds from their massive penis guns to assault the enemy and just to put the icing on the cake these spores explode when reaching showering the enemy in various nasty liquids. Damn it GW, stop letting Slaanesh write bad xenos slash fiction!
It is no wonder the models look so derpy all the time. Looking utterly clueless and slow it is a wonder if the 'vores could do much in combat if attacked. The fact they are rumoured to have been created using Ork might go a way to explain that; putting two brainless species together is never a smart move...