In sports; to go for and miss a single extremely difficult play or shot repeatedly and stubbornly, thereby ruining any chance of success in the overall game.
"Dude, you were winning up till that 10 on the par five. What happened?"
"I totally tin cupped it man."

"Did you see Joe tin cup that basketball game?"
"Yeah man, he had the wide open lay up but just had to go for the three."
by mrbojangals May 28, 2010
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When you are pursuing a member of the opposite sex.
Hey did you see Royal and Morgan?
Tin Cup?!?
Yep! Tiiiiiinnnn Cuuuuup!
by kernelcornyjoker August 31, 2011
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To beg/ask for money
Beggars frequently use a tin cup to beg for money, therefore tin cupping
by Trey Lawless June 26, 2006
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To fall in a very serious but yet very funny way
" You shoulda seen that moron, he was walking down the hill and went ass over tin cups "
by vwaynev June 17, 2008
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