The cilantro in-joke appears to have started due to this post, in which well-loved mefite/metachatter interrobang attempts to find out who else hates cilantro. Several people agreed with him, but it is at this point unclear whether the cilantro in-joke is making fun of interrobang or not. Either way, cilantro
sucks doesn't suck could make a horse gag from twenty paces is super yummy tastes like the kind of barf you would barf if you first ate a whole pot of barf, and then barfed it onto a pile of dead pigeons is an essential delicious part of many world cuisines is a regrettable misconception on the part of a blind idiot god is green and harmless and never did nuttin' to nobody was created by satan and may be initially tempting, but is in fact quite evil. Damn you, Satanists! is completely necessary for yummy Indian food was inflicted as one of the Seven Deadly Fads on civilization back in 1997 as a pre-emptive punishment for the absurd derivativeness of "The Matrix" can be had from illicit dealers near the edge of town:  just wants to go home.
- "I think I get the cilantro thing now. It's like, if you're pro-cilantro, you're a yuppie motherfucker who, granted, likes other cultures, but not enough to use the proper terminology (e.g. panini/panino). If you're anti-cilantro, you're into down-home old fashioned high-cholesterol America. Ah, the eternal struggle rages on." 
Cilantro/Anti-Cilantro T-Shirts (not a Metachat project)