Acronym - In Before The Spam
Generally
posted on a forum after an announcement by
somebody important and/or concerning
something important, where everyone generally replies quickly with stupid shit.
Works similarly to IBTL.
Administrator: This is a very important announcement about this website/
game/forum.
Person
1: IBTS!
Persons 2, 3 etc: OMG WTF
STFU NO WAI