Airstrument 

The act of playing an instrument in the air such as the air guitar, air trumpet, air flute, air drums or any other instrument you desire.

Dave airstrumented to the journey song the other night.

Airstrument by Tizzette April 24, 2013

Asstrument 

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.

Asstrument by Le Pétomane September 9, 2012