"I Beat The Lock": IBTL is an acronym used on an internet forum when a poster has judged a thread to be due for locking by an administrator due to off-topic or offensive content. Use of IBTL is a declaration that the user has "won a race" versus the forum administrator, who is about to close the thread.
Original Poster: Hello, I have a wonderful real estate venture for you - a fine bridge spanning the water between Manhattan and Brooklyn!
Second Poster: OMG this is such a scam!
Original Poster: No, I swear this is real! All I need is your bank account number for verification!
Third Poster: scam. IBTL
Fourth Poster: IBTL
Administrator: thread locked.