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An abbreviation for "Too Young For Those Tits" Usually when you see a young/teen girl with massive tits that biologically shouldn't be as big as they are.
Me: Hey, did you see Stephanie? She's definitely TYFTT.

Friend: I know man, she's only 16 and has HUMONGOUS knockers. I'm not complaining though.
by Jakeeeeeeeey January 08, 2012
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An abbreviation mostly used on facebook which is the short form for "thank you for the tag", people often write this on photos in which they are tagged in.
John Smith tagged you in a photo

Cooper : tyftt...
by harry14 July 10, 2011
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