While intensifiers similar to hella exist in many colloquial varieties, hella is unique in its flexibility. It can be used to modify almost any part of speech, as shown below.
That pizza was hella good: hella modifies the adjective good, where Standard American English would use very.
I ate hella pizza: hella modifies the noun pizza, replacing a lot of.
I hella bought four pizzas: hella modifies the verb to buy, replacing really or totally.
I ran hella quick to the pizza joint: hella modifies the adverb quick, replacing very.
— On the Wikipedia page for Hella.