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1.
In Before(B4) Locked
Usually used in forums where a controversial topic is being discussed. Opportunist posters will want to leave their mark by simply posting "IB4L" in the forum thread before the it is locked by forum administrator.
by halfway there July 18, 2006
 
2.
In Business For Life.

1) Meaning that your job is rewarding and supports the bettering of humans.

2) Your job saves lives.
I enjoy being a nurse because I am ib4l.
by qwertyup June 05, 2009