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
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a bitch that calls me "Jetziba"
Duffie: JETZIBA!
Me: Fuck Off.
by Jetzi February 19, 2004
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dropping down from higher level irish even though they're up to standard in the subject!

can also be used when dropping down from any subject
'man fuck this i'm already doing 6 honours for the leaving so i'm duffying irish'
by erp2themax November 8, 2009
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Nice duffy.
What a colorful duffy.
Where did you get that duffy.
by sportsmangi September 5, 2010
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to premature ejactulate; to ruin one's reputation by releasing skeet all over a girl
He blew his chance when he blew his load too early, his duffy was his own cockblock.
by SamFlash February 23, 2006
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A half hard boner or chub
Are you hard?” “ No man, I just have a Duffy”
by Funnyguy67890 July 11, 2018
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