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2.
To play a bass guitar or bass instrument with such abandon you would be fired from a band if you played in it. Usually to let of emotion. Much like jerking offor masturbating without the mess.
1. I masturbassed and found a new song!

2. I masturbassed earlier to let of some steam.

3. The crowd loves it when I masturbass... too bad my band doesnt.
by Connor P April 14, 2006
 
1.
When one masturbates while listening to loud club/house music
Swedish House Mafia turns me on so much I masturbass all the time to it
by Thatwanker September 26, 2013