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The unknown and rather disturbing substance that accumulates under your nails following scratching an itchy ass; a less dense form of ass cheese.

Also, a reference to something nasty;
"DUDE! Quit digging in your ass! Now you have rectal butter under your nails!"

"That chick needs to take a damn shower! She smells like rectal butter!"
by m_4_reall March 12, 2010
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Jul 19 Word of the Day
the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower
dude i had the best memory wank the other night, i was thinking about that time I walked in on your mum in the shower
by fonzatron2000 April 28, 2007
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