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5.
In the act of sex, when the male is ready to ejaculate, he pulls out and inserts the tip of his penis into the nostril of the sex partner. And ejaculates inside of the nasal cavity. Ending result is sperm dripping down the throat of the sex partner.
Judy: Hey Amber why does your nose look all red?

Amber: Oh he Duffy'd me last night again.
by jewbone25 August 16, 2011
 
1.
"verb/adjective" A terminology commonly used in the inner city of Baton Rouge, La. It is used as another word to described the act of something being or going "crazy" "gangster" "retarded". It caught on after being profusely used in the local documentary "Thuggin It and Lovin It".
"I done already took over Sherwood... I f***s with them boys in Glen Oaks, they already know I go DUFFY!" --Rambeezy

"Thuggin' It and Lovin' It"
by PrincessDorky August 08, 2009
 
2.
describes a buttocks, bum, or butt
Look at Sean's duffy! What a hottie.
by SeanDuffy March 22, 2014
 
3.
A man that is a regular smart ass on a day to day basis. He is an amazing singer, a killer lover, super smart. Really one of those people that you can check all of the above on. Men want to be him and women want to be with him. He is smart, witty, and loves bears.
Krystal: OOO girl look at him he is the cutest guy in her, and he is coming this way!!!

Lena: Thats what you call a fine ass Duffy!!! They are rare and yearn to be tamed!!
by LenaBear October 17, 2012
 
4.
whem someone did something bad/wrong/stupid is when someone "pulled off a duffy"
old man: yall duffed up kids! im calling the cops on you!
bad kid: you duffy *pulls out gun*
by Lohn Fon Bon John June 11, 2014
 
6.
To goof off most of the day at work.
That guy has been reading espn.com all day.
Oh, he's pulling a duffy.
by CoolMD March 31, 2006
 
7.
A word used to describe a person or action that is DUFF related. It is often used in cases of extreme gluttony, cock blocking, being a fat bitch, being an ugly bitch, and/or being a fat and ugly bitch. NOTE: One does not necessarily have to be a DUFF for this word to apply to them.
"Miranda, you cockblocked Mark from getting to that hot chick over there? That was a pretty DUFFy move."
by hawker240 October 13, 2006