Nonsense that people from California latch onto in order to feel unique. While it is typically used in front of nouns to emphasize said noun's particularity, the only word hella truly belongs in front of is copter.
(adv) A word that makes things better. Usually used in the 'pretense' form. Used to make things sound better, and more awesome. To describe a party or event.
Ex. 1
Bro 1: Hey man you want to hit up that party?
Bro 2: F**k yea man that party is gonna be Hella Fun!!
Ex. 2
Bro 1: How was last night?
Bro 2: It has hella f**kin' awesome.