This sexual manoeuvre requires one male receiving oral gratification from one (or more) female's. When the male in question ejaculates in the females throat, the female will the close her mouth and squirt out of her nose. Thus causing plenty of spaff to speed out of her nasal cavity, causing the Double Barrel Cum Gun effect that is desired.
Dave: What did you get up to last night then?
Matthew: After I finished I made my missus Double Barrel Cum Gun.
Dave: Oh respect.
Definition:
to get shot by a BB gun; to get called a BB
to shoot shoot someone with a BB gun; call someone a BB
Origin: play on words of BB, short for Big bitch or Big Bastard
Related; BB
Did she just shoot you with the BB gun?
Yes, even though she's a BB herself
Shotgun, slang since a shotgun does shoot BB's like birdshot, buckshot, etc. The use of "BB gun" is not as alarming to people who might overhear the conversation.
Cops: Where's the gun, where's the gun?
Guy on ground: Just the BB gun I threw it over der
(reviewing Ring camera footage Dec 10 '21 Houston where we see five shotgun blasts at oncoming police cars)
Pleasuring a girl using a Vulcan salute
“Hey Jim I double gunning Uhura last night and she simultaneously farted from both holes”
An American tradition where for about a week following a widely-reported mass shooting, everybody pretends to be an expert on firearms and on gun control legislation.
This guy on the news is talking about regulating magazines and stocks, it must be gun week! I wonder who died?
She got banged in the head with a gun. - bang with a gun
Placing pez in your pee hole before you nut inside an orifice
Bend over, looks like you need a Mississippi blow gun!