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
"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
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
describes a buttocks, bum, or butt
Look at Sean's duffy! What a hottie.
by SeanDuffy March 22, 2014
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
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
Polo, collared shirt.
Nice duffy.
What a colorful duffy.
Where did you get that duffy.
by sportsmangi September 04, 2010

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