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A person from the East Coast of any country. Or any city or neighborhood with an east side. Basically, anyone who isn't from the West Coast and doesn't know what a real gang sign looks like.
I'm from the East Coast, baby. You're just a West Coast loser who thinks gold is cool.
My cousin moved from the East Coast and now thinks the West Coast is just a fancy suburb.
Eastsider here. You're not even from the same planet.