To insert testicle(s) into the female's vagina whilst having anal sex as you ejaculate.
Dave: Oi Steve guess who I fucked last night
Dave: That girl Ellie from down the road
Steve: Nice, I heard she's right filth
Dave: Yeah man I put my balls in her minge when i spunked in her ass it was peng
Steve: Isn't that called a Tringo?
Dave: Fuck knows