When a girl or gay male is eating out a guy's asshole while giving him a hand job from the back.This resembles the act of playing a trombone with a rusty mouth piece.
"Yo that dirty hoe gave me a rusty trombone last night."
"You ever give a rusty trombone before?"
when you piss down someones back
"brent was drunk and pased out so we gave him a cuban waterslide"
when your fucking a girl from the back and you wipe your choda and then hold it over her nose while fucking her from the back
" Whats that smell?? its the august vapours hoe"
"yo i gave your mom the august vapours last nite..she loves baller dick"