Herf has the same meaning as "help", just typed to fit asian english.
HERF, SOMEONE'S ROBBING ME.
Omg, he's too cute, herf.
by Danico888 July 5, 2018
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It is discribed as "Fucking the fucked"; To have sexual intercourse with a fucked up person. May sound unusual in a way to make people just say: "Was that a threaten?" or Having no idea of what has been said..
DUDE!? I totally saw you and ashley herfing the derf with each other.

Parents: Did you do anything dirty in tha room?
Me: No? I was just Herfing The Derf
Parents: Oh Okay good?
by TheGuyWhoCanTalkLikeThis May 22, 2011
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