A dirty trick you pull on a friend at a party, where you hold a towel over a friends face while he tries to do a sit up with you pulling down on it. While your friend tries to do this sit up you have another friend bend down over him and pull down his pants then you release the towel and your friends face goes into an asshole.
Kean: Aw man I was so drunk last night but I sobered up really fast when Darren and Matt got me to do The Impossible Sit Up.
by Matt Walters April 23, 2008
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A dirty trick you pull on a friend at a party, where you hold a towel over a friends face while he tries to do a sit up with you pulling down on it. While your friend tries to do this sit up you have another friend bend down over him and pull down his pants then you release the towel and your friends face goes into an asshole.
Kean: Aw man I was so drunk last night but I sobered up really fast when Darren and Matt got me to do an Impossible Sit Up.
by Matt Walters April 23, 2008
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take turns seeing if someone can do a sit up while someone covers their face with a towel and holds the towel to the ground, then someone squats over their face and spreads their ass cheeks, then as the person is trying really hard to do the sit-up, slip the towel off, and watch as their face gets buried between the fat sweaty ass cheeks.
"bet you can't do an olympic sit-up"
"your on"
*GRUNT*
"WTF!! OMG!! WHY would you!!!?!?!?"
"that was a very shitty sit-up"
olympic sit-up sit up shit ass
by browngnome November 6, 2010
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The act of performing fellatio to one's self as a form of masterbation. More properly and politely referred to as self oral or autofellatio.

It is physically possible for men who have sufficient flexibility or penis size or a combination of the two to perform the naked sit-up.
Statistics show that every 3 out of 1000 men are capable of it.
The naked sit-up was given its name because when one tries to perform it, it looks as though they are trying to do a sit-up (and usually failing stupendously) while naked.
It is rumored that Marilyn Manson had his botton two ribs removed to be able to do the naked sit-up.
Man1: "DUDE!!!! So guess what I did last night!"
Man2: "...what?"
Man1: "I sucked my own dick!"
Man2: "WHOOOAAA SHIT BRO!!! YOU DID A NAKED SIT-UP?!?!"
Man1: "Fuck yeah!"
Man2: "OH MY GOD!!! TEACH ME YOUR WAYS!"

Girl1: "Ew! So last night I walked in on my brother trying to do the naked sit-up."
Girl2: "EWWWW!!! That's like sooo gross, like oh my god... ew."
by zoee-owee-owee September 18, 2010
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When in a depressed state where one is immobilized such as in a bed, couch, or chair, the act of sitting up every 5-10 minutes like you are about to get up and do something, but then eventually laying back down to your original position because they could not muster up enough energy to actually get up.
Nah man I’m doing great. I even worked out- I did depression sit-ups all night while binge-watching King of the Hill on Saturday!
by bob_swaget January 5, 2021
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A german sit up is when you pick a kid (usually an prick)and ask him if he can do a german sit up. If he says "yea i can" tell him to lay down, blind-fold the kid and hold his shoulders down.
Now here is the fun part, get a friend to sqaut with his pants pulled around his ankles and put your butt in front of the kids face. Now the people who are holding him down let go of the kid - resulting with the kids face ending up in the sqauters ass.
Todd:" Lets make Robby do a german sit up"
Jack:" Dude, thats messed up... LETS DO IT"
by cody_2012 February 14, 2008
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When you crouch over a sleeping dude's face and punch their testicles, immediatly causing a reflexive situp, so they sit up and their face hits your ass.
Hey, that private over in the LCA just gut atomic sit-upped.
by Dominic B. March 4, 2004
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