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Aggressively grinding each other while making out.
Abby was derfing so hard last night with him.
derfing by yunglivin September 1, 2019
Sex with clothes on
Cooper: hey Claudia wanna go derfing later?
Derfing by Derfingyurrrmom October 30, 2019

Dolphin Derfing

The act of dry humping with oscillations occurring rhythmically taking the form of the wigglings of a dolphin out of water.
Dude are you taking that Provo hair school chick out again? Yeah dude, if I play my cards right we’ll be dolphin derfing hard tonight.

derpling 

Someone who follows one who derps, while reciting that derp like dogma.
Dude, stop being a derpling and actually try to figure out stuff on your own!
derpling by smpier August 28, 2010

DeFlinginaw 

A combination of Michigan cities: Detroit, Flint, and Saginaw.
Hey NaStassja, where were are you from?
- I'm from DeFlinginaw, MI.
Where's that?

-Well it's a combination of Detroit, Flint, and Saginaw. See I was born in Flint but raised in Detroit, Flint, and Saginaw so yea.
DeFlinginaw by Dr. Nyte September 22, 2018
the act of fucking a girl who is way below any normal standards
person 1:so i heard you went derfing last night.
person 2:yeah, I took pcp.

I wanted to go derfing, to I found the girl nicknamed Trailer Trash.

Bonus points if they have a kid.
derfing by fred v. September 15, 2006