A fork of Rural Dictionary
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
Failed named of Bullymongs in Borderlands 2.
The so called bonerfarts beasts, were originally called Bullymongs, but the creator of the name realised it was a dumb name, and so they are called Bullymongs still!