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Person 1: brb
Person 2: HF!
...
Person 1: back
Person 2: Did you have fun?
Person 1: Well I went to pee so yeah...
by NEEEEEEEEEEEEEEEEEEEEEERD. December 19, 2011
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High Frequency

radio communication services from 1.8 to 29.7 MHz, used for long-range communications, the only band used for worldwide communcations other then mircowave and UHF satellite services
"Johnson, get Washingtion on the HF"
by IrishRepublicanArmy October 12, 2003
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6
H.F or HF means Heart Failure

Or simply being too full to the point of almost dying.
Severe failure of the heart to function properly, especially as a cause of death.
Bro these noodles are HF don’t eat them. :/
That burger causes HF but fuck it
via giphy
by YungBoof April 05, 2019
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HF is short for hooker face. A term used to describe a chick that resembles a hooker in the face posibly due to too much makeup or drug use.
Hey HF how ya doing today? You have a good night last night with your new "friend"?
by Cindy Chaparelle July 11, 2011
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