Top Definition
Abbreviation for That Is Really Funny (it's the new "lol"). It can also be used as an adjective to describe something funny, and when people ask what it means, you tell them, and then they say it doesn't make sense, and then you say to yourself: tirf.
That comment you made about that whore is really tirf.
by -dH- August 30, 2005

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Stands for "This Is Really Funny". You use it when you find something really funny. Used by people who are sick of hearing and using lol.
Man: Oh man tirf!
or
Man: Oh man that's tirf!
by mechristof September 03, 2005

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt