Top definition
To masterbate so quickly and vigoursly your actions almost reach the speed of sound.
Speedshifting works well if you are in a hurry.
by 70GR March 03, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

Alphabetical list