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.
(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.
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.
The act of two women embracing ex hugging or scissoring and their clits randomly touch, bouncing of each other, resembling the sound of punching a speed bag
When Tina hugged Sue their clits were speed bagging so much it sounded like someone kicked the spring door stop!