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1.
One who has metal in their mouth.
Commonly referred to as "braces"
"Dat bitch is a tin grin!
lolz"
av BUBBASPARKZZZ 21 oktober 2007
 
2.
a smile on a person with braces
I think he would get more compliments if he didn't have that tin grin.
av The Return of Light Joker 18 januari 2010