What does IIABDFI mean?
If It Ain't Broke, Don't Fix It
Other definitions of IIABDFI:
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How to use the term IIABDFI:
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More slang terms:

RWNJ
Right Wing Nut Job

SMHO
Screaming My Head Off

BD
Brain Drain

BFFLNMW
Best friends for life, no matter what