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San Francisco Backfire

The act of trying to fart while a penis is going into your butthole, and when put in with enough velocity the gas bubble makes its way up and you end up burping.
Greg: Man I shoved it in so quick last night right before he farted that it went up and she had the old San Francisco backfire.

bazinga backfire 

if someone says bazinga and another person does whatever caused the first person to say bazinga better than they did.
adam - "i just snogged that way hot girl over there...bazinga!"
sam - "yeah, but i just tounged all her mates...bazinga backfire!"

Bulgarian Backfire 

A bulgarian backfire is a Halo 2 term. It is when a player tried to stick another player with a plasma grenade from point blank range, and the plasma bounces off the player and sticks to the person who threw the grenade.
"D00d! Sum n00b stuk m3 wi7h a Bulgarian Backfire last night on Xb0x Live!!!!11!!!11 I wuz s00 pissx0r3d!!!111!!1!1
Bulgarian Backfire by Led Zelda December 5, 2004

Hormonal Backfire 

The guilt you feel after ejaculation if you let your hormones take over your rationalization skills and you become really dirty-minded towards someone else in which there's something to regret afterwards.
Jamal: Dude I sent nudes to Jessica and I felt scared later
Mike: Sounds to me like hormonal backfire
Hormonal Backfire by KoolDashKid November 25, 2017

bronchial backfire 

Refers to da often-moderately-painful experience dat follows an especially "heavy-duty" cough, burp, sneeze, etc. --- a small amount of stomach-acid will travel upwards into the throat and create an acrid burning sensation.
Shortly after consuming a large meal is one of the most notorious times for a bronchial backfire to occur; it's wise to have a large glass of water or milk handy to hastily swig from in case of mishaps like this.
bronchial backfire by QuacksO June 13, 2019

Muffler backfire 

When a girl is giving you a blowjob, and while choking on your dick, she accidentally farts.
So my girl was choking on my cock, and had a little muffler backfire.

I think my girl had to shit, because while she was gagging on my cock, she kept hitting with a muffler backfire.
Muffler backfire by MURDOCK813 February 24, 2021