Top Definition
'Trench Wanking' is the activity of masturbating the phallus with gritted teeth whilst crouching and pointing aggressively at the subject of the aforementioned sexual practice.
"Hey Toby, look at that girl, she's pretty hot!" *crouches and begins Trench Wanking*

"Oh yeah, I'd Trench Wank over her. In fact, I will right now" *crouches and begins Trench Wanking*
by John Ever So Rightly August 27, 2012
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