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
7 Words related to in before the lock

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