Top Definition
1) When you slink off to secretly have sex with someone you shouldn't. Usually because you or they are in a relationship. Someone who stealth fucks is usually a stealthy fucker, and you can recognise them by the fact that they melt into shadows and you don't see them for hours.

2) When either or both parties are unsure if penetration has occured; a situation that only occurs with very loose women or very small men. Will always occur when the two are put together. Stealth fucking of this kind is often coupled with the question- "Is it in yet?"
1) "Jake's gone again! He was just here! Call his mobile. What? Switched off, eh? Bet he's gone off for a stealth fuck"

2) "Julie needs to tone up. I'm not satisfied with this stealth fucking nonsense"
by MagickDio March 02, 2010

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