1 definition by fattymatty3000

Top Definition
IBM
Instant Boner Marker.

The acronym is pretty self explanatory. To be used to describe a hot chick. If she is hot enough to be an IBM, you will get a boner instantly.
Damnn check her our, she's an IBM (Instant boner maker).
by fattymatty3000 June 26, 2011

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