What does TBIF mean?
Total Buy In Factor
Other definitions of TBIF:
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How to use the term TBIF:
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More slang terms:

R-BOMB
this is just for blackberry users, and since everyone uses iphones, you probably will never need to know this. blackberry messenger is called BBM. if someone doesn't respond to a message, they r-bombed the person who messaged them.

MFZ
Microsoft Free Zone

PTO
Power Take Off Unit

ICE
In Case of Emergency