What is Impossible Sit Up?
1.
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.
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see knee sex
To get have one's knee fondled, stroked, or stimulated in any way by your knee buddy.
Wow, did I get some good knee ..
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Spread the skin of your ball sack and make into a bowl. pour some sort of liquid into the newly made bowl. Swiftly jump up and down so t..
