During a moment of extreme sexual daydreaming or during a masturbation session, the raging boner manually overrides all bodily functions. Resulting in a non-consented fart.
"I can't make it 5 minutes into that porno without a boner fart, the acting is that good."
by Ekim C Live August 08, 2013
3 more definitions
When a man sees something stimulating, and ejaculates a small amount (or large amount) from the visual stimulation alone.
While watching TV last night, your hot sister showed up on the latest girls going wild commercial and caused an instant boner fart.
by ronchx October 24, 2009
When a male ejaculates in Alaska, and only steam comes out. The steam is called the fart hence the name bonerfart.
Don't move to Alaska, or else you'll just be having bonerfarts
by ReachCarter November 06, 2014
when you have a boner and it farts at you.
dan had a meen boner fart, it wouldint stop barking at the kids.
by slap happy rice July 17, 2007