British slang for fellatio.
Me mum caught me and Robbi garden gating.
In desperate need to defecate.
Got to go, Mr Brown is at the garden gate.
to describe something so slippery and slick that it will slide off of any surface, or a person who is so untrustworthy and clearly greasy that they gleam in the sun.
"You heard about Donny snitching to the cops?"
"Yeah. That dude was always slicker than gopher guts on a garden gate."
"Real Talk"