Usually a female friend of your girlfriend. You HAVE to get on with her for the sake of your relationship but she doesn't make it easy! She'll make sarcy comments, Make fun of you and demand to be everywhere that you and your girlfriend go.

Listen to "Big Fat Friend by Stephen Lynch" for more info :P
Guy 1: Oh hey did you end up getting with Rachel last night?

Guy 2: Nah her Big Fat Friend was there the whole night, Wouldn't fucking leave man

Guy 1: That sucks, just bring her a picnic basket next time!
by Killleera7x December 23, 2008
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On March 31, we all take time to appreciate our plus sized friend we have.
Hey Don, its March 31, so let me take ur fat ass out to eat for Fat Friend Appreciation Day
by Jimmycrocker March 14, 2022
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National Fat friend day where you celebrate ur big friend. Get them lots of food to fill there large bellies.
by Mikethegreat3 November 11, 2022
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On the 27th of June, it is Fat and Ugly Friend day. Show some extra love to your fat and ugly friends.
i love you bro
“bro why u being so kind”
“it’s ugly and fat friend day dumbo!”
by Jejeieie June 26, 2023
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