1 definition by Silvergun Superman

When you shake your fist while raising your arm, much like someone with parkinsons does when they're angry.

It's also known as the Old Man Fist Pump.
A guy cuts you off while driving, you show him the Parkinsons Uppercut!

When someone tells a bad joke, you can let them know you're going to give them the Parkinsons Uppercut, in which you'll hit them 100 times...very softly.
by Silvergun Superman June 13, 2009
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