pumps

During workouts, your muscles fill with blood and swell. The swelling and stretching of your muscle is reffered to as "pumps"

It can also mean tapping thy girl's ass from behind.
 
As was posted above the local gorging of the muscle with blood is referred to as a pump! It is wise to keep in mind however that a pump means little as an indicator of a good wo!
peace
j
 
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