hella days

depending on the context of use this can mean any period of time from a few minuites to a very long time. It normally how ever means a long time.

it can also be a sign of agreament

guy 1: dude i haven't seen you in hella days.
guy 2: ya i know its been awhile

example 2:
guy 1: dude this is some hard shit
guy 2: hella dayssss

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