hows it rollin

Hows it rollin is a term used by gangstas translating to "are you on drugs"
If someone says "hows it rollin" and you are on drugs (usually weed or marijuana) you say "is rollin"

If you are not on drugs you say "its hangin" because your hangin around waiting for da stuff

Hey Tyrone my nigga hows it rollin

Hey yo is rollin Jamal