Slang meaning "really" "very" or "many" that Northern Californians think is really cool. When in reality the rest of Americans think its really very stupid.
Sally: Ugh, i just came back from my trip across Northern California
Sue: Was it cool?
Sally: Yeah, except those morons kept saying hella after every 3 words.
Sue: Hella? What the hell kind of word is that?
Sally: A lame one.