sneak fuck
when someone/something does something sneakily to fuck up your day or plans - usually friends doing it to prank you, but can be otherwise.
In Halo, when someone assassinates you from behind - they are a sneak fuck... especially when said person is on your team.
sneak-a-fuck
ahhh this one you don’t even wanna kno where THAT came from…but ill give the meaning anyway. It’s the only way for a straight girl to nail another girl. If youre having a 3some or even a 4some (if those exist but in todays society im sure they do) and while the “hot chick” so-to-speak is having fun doing her thing or w/e u nail her. But u be really sneaky about it. Therefore it doesn’t seem as though your not straight.
man+woman+hot chick={insert sneak-a-fuck here}
Sneak Fucked
When someone jumps behind you and scares the crap out of you in a most vulgar manner, mostly thrusting their crotch at your behind. The attacker usually screams the words “Surprise Butt Sex”.
Girl - Holy crap Liz, Mike just sneak fucked me.