ib4

An acronym meaning "In before...". Usually following some type of noun. Used on forums to state that someone is posting in the thread before something imminent.

Bob: God doesn't exist!
Joe: ib4 uber-religous christians

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ib4

ib4 means in before

Which you can also read about here: urbandictionary.com/define.php?term=in%20before

ib4 they lock up the rooms then lets get out!