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1.
crazy; hyper; gang o energy
Auto: high performance vehicle
"Them x tabs got your girl hyfey than a mug!"
"Dang homeboy! That 454 got yo 65 'Maro hella hyfey!"
by BayAreaPimpstress June 30, 2004
 
2.
Originally made in Oakland
means to be hyper ready to do what you gon do
Damn he/she is hella hyfey
by kiki March 16, 2005
 
3.
That's when you act all hyper and excited with an attitude like some heffer won't be backhanding you for gettin' all loud.
Don't be acting all hiyfee, Clofondra, we gonna get there when we get there, girl.
by RLp June 05, 2005