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brithish slang for uncool, loser, tacky, and strange, used often for people with less swag than you.
"Alondra and erika they got swag there sooooo not naff"
by abcccccccccccccccccccccccc September 14, 2011
Originally Naff was Medieval Scottish for vagina.
Princess Anne was once reported
to have said, "naff off."
by nv January 06, 2005