Duff

That place on the human body (particularly the female body) where the body makes contact when sitting-down, i.e. the erogenous area of the butt.

I'll bet her duff is as sweet as candy!

by anonymous March 3, 2023

Up the duff

An old Australian Slang term referring to an unplanned pregnancy, first used in 1941 and all the way through to around the 70s. Rarely used now a days.

Person 1: What is happening to her?
Person 2: She's up the duff.

by Shen Bapri March 23, 2023

Duff Buck

A currency used by 8th grade students on the Hawks side of Chichester Middle School that Mr. Bryan Duffy created during his time teaching for his students to earn and purchase valuables such as buying extra credit points on the final exam, buying a homework pass or a mechanical pencil.

Student: I would like to use a homework pass
Mr. Duffy: *Takes the Duff Bucks and marks as complete*

by VinnySarge June 10, 2025