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Upgrading the pups (pickups) in one's guitar.
Stan's guitar really lacked output and sustain, so he decided to install

Bareknuckle Juggernauts. Quite a pupgrade, indeed.
by Crayuns March 19, 2018
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2
The act introducing a puppy into a part of your life (Facebook profile picture, household, etc.) where no puppy was previously present.
"Did you see Dave's new profile picture on Facebook?" / "Yeah, it's definitely a pupgrade from his previous pictures"
by PsychMike January 14, 2013
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