the act in which one person provides sexual stimulation for another person by making a gun with their fingers, before thrusting the 'gun' in and out of another persons holes while making a shooting noise with their mouth.
Situation 1:
John: "I was out last night, and this dirty hoe asked if i would finger gun her, what the fuck!?"
Situation 2:
Person 1: "I was finger gunning your mum the other day and.."
Person 2: "Wait, what!?" *Beats the shit out of him*
Its when you put Duct Tape around your cock and piss hole and then Violently Masturbate so that when you climax your Cum has nowhere to go, like a Broken Squirt Gun,(Squirt Guns would always jam up with water)
Dude, I'm so bored you wanna go outside and play with Broken Squirt Guns.