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3.
A duck off is a girl/boy who is used for forms of sex in private but is rejected in public.

Some may be considered 'sluts' while others are average girls. Only about half of them actually know that they are duck offs.
Sam:She's beautiful, are they dating?

Jordan: No way, she's just his duck off.

Sam: Well I can't say much, I've been the duck off before.

Jordan: Me too girl.
by Urban Dictionary Staff & Crew October 02, 2009
 
1.
A polite way of asking a duck to leave you alone.
Duck off! I haven't got any bread left.
by Pennycook November 21, 2004
 
2.
As a noun, a duckoff is a person that is always reliable for sex. As a verb, it means to have sex. It comes from Greensboro, NC and is most commonly used by Eastside Gator Crips.
Noun
boy: Who is that girl?
boy 2: that's my duckoff.
Verb
boy: Where are you going man?
boy 2: I'm bouts to go duckoff.
by Joi June 29, 2004
 
4.
1) to go off with another person to have sex.
2) to already had sex with a person
1) i wanna duck off with that bitch tonight, yo.
2) i ducked off with her so long ago.
by Miss Kiara October 12, 2007
 
5.
a duck off is basiclly a bitch who is ugly as hell but you use her to get right
DAT BITCH IS A DUCK OFF
by KENT ROB January 14, 2009