A sudden, unsuspected violent attack to someone's face using your privates as the weapon of choice. Usually done when a victim's face is exposed and vulnerable to attack.
"This nigga Jeff was falling asleep and I bombisha'd the shit out of him so hard that he fell back"
The phrase is used as an insult or an interjection expressing disgust or anger. Derived from the Jamaican word bomboclaat, bomboshart is a combination of bomboclaat and shart.
Joe: Hey, where have you been all day?
John: Just finished up in the washroom.
Joe: “BOMBOSHART”