Someone who acts like your friend-they talk with you and hang out with you-one night a week, but then any other time you try to talk with them they ignore you.
She was such a great friend yesterday, but today she isn't responding to my text messages. She's such a Friday night friend.
by AtomicWookie September 24, 2010
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Person that will come round your house on friday night for chilling if you don't feel like going out.
Normally of the opposite sex.
Ben: Hey - wanna come round mine?
Ellie: When?
Ben: Friday night, i just wanna chill...
Ellie: Ok then my friday night friend you...
by Benko October 7, 2005
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