Top Definition
It means you asking someone what is the temperature outside or inside. Can be "What's the C" for Celsius areas. (Or even K, if you wanted.)

Response ends with the actual temp. but you just say the number and 'F' at the end.
Dave: Hey dude what's the F?
Steve: It's 75 F.
by ArctixFawx June 17, 2011

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