sneak one in 

To try to have sex with a woman while she is sleeping. Usually this is done to a girlfriend or wife. Otherwise some of the more conservative people could profile this act as rape.

Guy 1: Hey man what are you doing?
Guy 2: Nothing just at my house and my girl is asleep and I really need to bust a nut.
Guy 1: I recommend you sneak one in.
Guy 2: Capital idea!

sneak one in by Senor Ringpiece August 18, 2009

one-cheek sneak

A type of fart that is done while sitting, the one-cheek sneak is done by leaning to the side to let the gas excape. Very handy when sitting on a smooth, hard surface while wearing shorts, to prevent "hovercraft" sounds.

To avoid disrupting the classroom, Johnny let out a one-cheek sneak, and nobody was the wiser.

one-cheek sneak by Turnspike February 11, 2003

one cheek sneak 

the act of quietly squeezing out a fart when sitting down by leaning to the side slightly and raising one cheek.

My girlfriend always knows when I fart because even though I do the one cheek sneak, I always give it away with my farting facial expression. Not to mention that the room also smells like a fucking animal died in there!

one cheek sneak by the prophet March 26, 2003

one cheek sneak 

An attempt to pass wind without making noise when in a seated position by leaning to one side while tensing one butt-cheek.

I had to fart in court so I busted the one cheek sneak.

one cheek sneak by hoot rider January 5, 2010

Sneak up on one cheek 

To discreetly fart while in a crowded place.

"If I sneak up on one cheek, hopefully no one will hear me fart."

Sneak up on one cheek by creedmoor November 22, 2004

one cheek sneak 

A George Carlin joke: You lift one butt cheek and muscle out a small fart. It would usually sound weak, unless you powerhouse it. Best for church.

Kid: Oh man *lifts one cheek and lets out a small fart*
Preacher: mmmm, sweet Jesus.
AFTER CHURCH
Kid: I call that one the one cheek sneak.

one cheek sneak by The JoshMeister101 June 8, 2009

One Cheek Sneak 

When recieving oral from your partner, you tell that bitch to close his/her eyes and open his/her mouth (making him/her believe you are about to blow your load) then you turn around and expell vile ass fumes into your partners open mouth.

Yo dude, i gave that bitch from the bar a one cheek sneak she will never forget!

Hey dave, I totally just shit in this girls mouth, she never saw the ol one cheek sneak coming!

One Cheek Sneak by Dirty Mike and the guys December 27, 2010