When you initiate rookies by restraining them from sitting up with a pillow or rag etc and removing it while someone stratles above the pillow with their pants down. Move the pillow and as a result the rookies face will procede into the guys asshole. Resulting in a brown nose.
Barney Dawg was so retarted he tried an impossible sit up and got shit stained . What a douche. Mccoy Sports 4 life
by COdy aka big dagg September 20, 2004
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by IMpossible Love November 9, 2012
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Action. To straddle someone's face and to place your asshole over that person's nose while they sleep, then as they awake from a punch in the groin...well you get the picture. Ta-da! An impossible sit up.
by Godsbest September 2, 2003
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by TheCrazyMaddie November 12, 2010
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