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1.
The feeling of nirvana and fulfillment one gets from a particlularly awesome drum solo. I sthe feeling of being engulfed by the rythem and feeling like your body is moving just by the beat.

often accompanied with drummer face
A: Dude you were the shit on the drums tonight!

B: I know, I totally had a drumgasm about two minutes into the thrid song.
by Ryan Iyde June 16, 2007
 
2.
The point during a drum session when either the drummer himself or herself or a fellow listener gets a double kick to the face that instantly explodes on the inside in a good kind of fuzzy way. Similar to a guitargasm.
I got a drumgasm from Neil Peart and I've never heard one Rush song! How is this possible?!
by Ellisniss MGP January 16, 2010