situp 

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 .

situp by seven.56789 July 20, 2010

the impossible situp 

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.

the impossible situp by Combat 84 June 30, 2004

power situp 

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.

power situp by GG January 24, 2004

atomic situp 

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

atomic situp by Double fisted Bobo August 18, 2003

impossible situp 

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!!!

impossible situp by Q ha May 23, 2006

atomic situp 

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

atomic situp by chickenmanty December 8, 2003

bionic situp 

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.

bionic situp by allhallowsian March 5, 2013