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1.
Phrase used to imply that a forum thread is either stupid or pointless and is going to be locked by a forum mod/admin. It's a much cooler way of saying "I bet this thread is gonna be locked soon".
OP: Hey everyone, I thought I'd just bring up something that's been posted several times before...

OP+1: In before the lock! ;]

Forum Admin: I'm locking this thread because its stupid and pointless and has been brought up several times before.
by Atomik Spongeface June 21, 2008

Words related to in before the lock

admin before forum in lock mod the