1 definition by Stungirl<3
Short way to say "thats not funny." Usually used online, after a sarcastic laugh at something someone said.
Girl: omg I'm lik sooo hilarious, i told a joke today in class it went like this: *lame joke*
You: Hahahahahahahaa!
You: Tnf.
You: Hahahahahahahaa!
You: Tnf.
by Stungirl<3 November 23, 2012