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A laugh one has that only comes out of their nose. Breathing heavily out of your nose in laughter in place of out of your mouth.
"I was watching Comedy Central. The comedian made me hiff a lot."
"His joke made me hiff."
"I was hiffing a lot at how funny the new kid was.
Hiffing by kpillow August 31, 2010
Related Words
Originates from "Hefner". Heffing is the act of being a player, or pulling more than one girl or guy in a night.
Dude, I got two numbers last night .That's heffing awesome!

I hooked up with Becky and Cindy last night. Dude you're heffing around

See Horace on the dance floor, he's heffing right now.
heffing by Lilstickman November 6, 2017

Heffington 

What only can be decribed as the heaviest object around.
Heffington by SNOW BRAINIAC November 8, 2018
to eat a lot; to pig out on food
Angela was heffing on her takeout chinese food
heffing by orangechiken September 19, 2022