Trouser truffles are the endearing term for testicles used widely by posh cunts & snobby fuckers
Snob "Oh darling lick my trouser truffles"
Posh cunt "oh yes dear"
Trouser truffle is the metaphorical mushroom ( a penis ) that grows beneath one's trousers.
I'm tellin' ya bro. When she bent over my trouser truffle went in full bloom.