When a person in a relationship (open or exclusive) finds out their partner has slept (had sex) with their friend/associate.
On BOTH seasons of "For the Love of Ray J", a girl had previously had sexual relations with one of Ray J's friends.

"LUSCIOUS! SHE Smash-da-homie"!
by K!n@K@tzWhrIz@t February 15, 2010
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To fuck a friend of the friend that ur trying to hook up with
stevie j and benzino off of love and hip hop Atlanta. Joselin smashed da homie
by Mr,MIke September 10, 2013
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