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A word to describe a boy who when enters a realtionship, becomes obsessed with the girl to an extent where every second word from his mouth and social network update is about how much 'love' he feels for her.
Fred looks at facebook and sees, for the fith time in a row
"Bill: I love you Colleen, you're my one and only!"
Fred - "Jeeze, that guy is such a jahn *hides from newsfeed*"
by KillPixie September 02, 2010
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Jahn is one of the best friends you can ever ask for, she can get mad and annoyed so easily, she can stress you out at times but you know she the best thing that could happen to you, jahn is sexy and fine and whoever has a jahn in their life is lucky , y’all niggas Better treat her well cuz you don’t see a girl like her these days
Jahn so poppin

Yo did you see jahn she so fine
by IAintHavingNoPiglets May 18, 2018
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The name for a boy who looks like a nerd young but grows up to be hotter than most of his friends.
Timmy managed to become a real jahn since we last saw him.
by SalvatorianJustice October 15, 2017
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Usually the last name of a gay kid named Casey. Tends to called 14-year olds gay.
Dang dude, thats a Jahns move.
by thatfourteenyearold December 15, 2010
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