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.
Friend: I know man, she's only 16 and has HUMONGOUS knockers. I'm not complaining though.
by Jakeeeeeeeey January 9, 2012
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.
by harry14 July 10, 2011