a state of physical/mental fitness at which a person can perform a given task most effectively. a person will be off their playing weight due to many factors.
Physical fitness:
"Hey let's play basketball tomorrow." "Okay, but not for too long, I'm not at my playing weight."

Mental fitness:
"David just had a tough breakup, and he's not ready to date yet. He hasn't been single in so long, he needs to meet some girls at bars and get back to his playing weight."

Skill sharpness:
"I can't play poker yet. Let me have a couple of beers so I can get to my playing weight."
by Papa Nooch June 16, 2007
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A term used by athletes to define their optimum weight for playing their desired sport.
Ron Artest trained hard this summer to get down to playing weight for training camp.
by RubySoho76 October 24, 2010
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