A young, attractive woman.

The youngest of the cougar family, she is in training.

All the girls want to be like her and all the boys want to be with her.

Hottie with a body.
"That's the best looking Thundercat I've ever seen!"
by cougarintraining October 7, 2011
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A big girl you see at the bar that has a huge ass and tight jeans, most likely with a pretty face, that is ready for a good time.
Whoa! check out that thundercat on the dance floor! I bet she'd ride me hard and put me away wet!
by TTTMoney December 23, 2007
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A vagina with a very strong and disturbing smell.
Man when I pull them pants down, I got a whiff of that thundercat.
by ojdajuiceboy April 8, 2009
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A sound a woman makes from her vaginal canal.
"Man, last night my girlfriend made the loudest Thundercat"
"You mean queef?"
"No, Thundercat"
by bombtrack_ratm December 14, 2009
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A phrase that can be used to express extreme joy and happiness for a team win or as a team cheer before a game. Comes from the old "Thundercats" show from the 80s and 90s, that everyone watched.
"Yo, we got a 99 on our final project, Thundercats HO!"

"We must wreck this other team, now huddle up, 1-2-3 Thundercats HO!"
by Paul Wall II February 20, 2007
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A yell of a once popular cartoon character.

Also fun to yell while running around in a supermarket.
This looks like a job for...THUNDERCATS HOOOO!
by wAsTe June 17, 2004
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