Top definition
A person who thinks they are awesome, and acts like they are the best/have the best tastes, even though they are way passed their prime. The name is relevant because they tend to 'Hi Five' after almost every positive event.

Similar to a Bro because of their tendencies to wear nothing but name brand clothing, and they're 'Party Life' attitude.

Made known by the Local H song 'Hi Fivin MF'
Mid 30's guy: "Dude, this concert is killer! WOO! FREE BIRD!"

other Mid 30's guy: "Fuck Yea! High Five!"

*Slaps Skin*

20-something bystander: "Jeez, what a couple of High Fiving Mother Fuckers..."
by BeckDylan612 September 10, 2009
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