A duff is a person who you use to get closer to someone, duff in my opinion mean duns,ugly fat ,friend.
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In high school their was a girl,her name was Sally,she have these super cool and super hot friends etc.but their was a boy that Sally like his name was Dylan,so Sally has a neighbour that love woman so she nearly talk to him,so one day she went to a party and she didn't dress as hot as her other friends so her neighbour,Mike saw her at the table when she went for a drink and call her a duff,so she ask him what does duff mean and as in my opinion he said duns,ugly,fat,friend and Sally was so ashamed that she pour her drink on purpose on Mike and left the party instantly,Mike told her that because she was the Duff so people would always use her to get closer to her friends which are:kimone and Gelesia,so the following morning she broke up with her friends.
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