Fisting the anus with both hands in a rapid succession.
That girls anus was used like an anal speed bag. Imagine Rocky Balboa punching a speed bag.
by Folks from D7 September 19, 2017
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(v) Masturbating. Whilst you masturbate, your hand may impact your testicles which share a similar shape to that of a speed bag.
After seeing those Sophie Howard pics, I felt the need to start punching the speed bag.
by Tman227 September 12, 2016
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The act of rapidly fisting your partners asshole as fast as you can.
Yo Johnny, I was Speed-bagging this girl last night, She loved it.
by Jehuis Saint Jerome April 25, 2022
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