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To pop a boner, get an erection, become engorged.
Usually in already awkward situations, like when dancing at a musical rehearsal, in the middle of class, etc.
In extreme cases, referring to the bruise a girl gets when having to come in close contact with said erect penis.
Jordan: Whoa, look at that guy! On a scale of one to ten, he's a fazio!!
Kaitlyn: Shit son.

Erin: Last night during rehearsal, we were working on leans and fazio really fazio'd me!
Kaitlyn: Shit son.
by k-medi October 19, 2007
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