I usually use this one to represent
Good point, it's somewhat close but doesn't convey the same message IMHO. It says one or more of the following 'that's messed up/gross/disturbing/I don't even want to know/what did I just read/stupid/embarrassing to watch/read' to me. The barf smiley is really specific and conveys the 'that's disgusting' point perfectly. I just found out that a barf smiley is available on SMF, please consider it Ron!