to leave the place that you've sat on

The action of lying down and situp to make your stomach muscles tougher
when there's an old person on the buss or train , you should situp and let her sit .

If you wanna make you stomach muscles tougher , you've to situp hardly .
by seven.56789 July 20, 2010
Get the situp mug.
when one bounds another across the head with a shirt and tells him to attempt to do a situp while an acomplice drops his pants and points his ass at the person doing the situp, at which time the shirt is released and the one attempting his the ass with his face
Damn, me and jorge got albert so good with that impossible situp.
by Combat 84 July 1, 2004
Get the the impossible situp mug.
This is when you get some beefcake who thinks hes hot shit to show off. Tell him that you are going to put a towel over his head and see if he can do the situp while you pull down. Being the arrogant moron that he is, he gladly tries. Have someone pull their pants down over his head and release the towel. The unsuspecting douchebag's nose goes right up the guys ass.
I wish someone would give Arnold the power situp.
by GG January 25, 2004
Get the power situp mug.
person 1 is baited into performing "the hardest situp ever". Person 1 then lies on the floor on their back and told cross hands on chest. Person 2 then holds a towel over the face of person 1 covering the eyes telling him sit up quickly with all his strength when he say to. Meanwhile person 3 has removed their pants and is squating over person 1's face with out him knowing. Person 2 then tells person 1 to sit up quickly and removes the towel as soon as the sit up begins. The result is person 1's nose is planted into person 2's ass.
Betcha cant do an atomic situp
by Double fisted Bobo August 18, 2003
Get the atomic situp mug.
when the sitter upper is blindfolded and then held down while he trys to do a situp. in the mean time another person puts theyre bare ass in his face and he is let go so is face smashes into the ass.
Dude we gave travis the impossible situp today and he smashed his face into codys ass, GNARRRRRR!!!
by Q ha May 16, 2006
Get the impossible situp mug.
when one is conned into attempting a "most difficult" situp resulting in a firm thrusting of the suckers nose directly up the shit pipe of a prankster. Usually results in prompt ass kicking and residual smell of butt mud for several days.
See the movie Heavy Weights or any highschool locker room
by chickenmanty December 9, 2003
Get the atomic situp mug.
The act of a person falling asleep at a party and one of his friends pulls down his pants and squats over the sleepers face, while another person punches the sleeper in the stomach, resulting in the sleeper violently sitting up and getting a face full of taint. Bonus points if the squater farts.
Dude, Jasper never passes out at Alvarado's house after he got his last bionic situp.
by allhallowsian March 2, 2013
Get the bionic situp mug.