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1.
Noun:

A musical instrument designed for rectal use.
1. Larry was born to be an asstrument player; his cheeks were rosy red and-a-ready for a rippin'.

2. Worn out after a long day of spouting shit, the asstrument section of the ASS(Alabama Syndicate Symphony) celebrated their hard work with enemas all around.
by Le Pétomane September 08, 2012