One who pretends to be good at a particular sport, but in reality cannot play it whatsoever. Can be used in a sentence with yayaya with severe sarcasm.
Also can be used as an insult term in basketball to an opposing player on the court who cannot play according to regulation(s).
"Yayaya! Way to shoot that airball, you're not STM."
"I enjoy the way you got blocked at today's game. Continue with your STM-ness and you'll be an all-star soon!"
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