go east coast

People from the East Coast are considered to have a tougher exterior and more street-smart than those from the West Coast. East Coast people are less likely, if at all, to take shit from someone else. To "Go (or going) East Coast" on someone is to make an aggressive threat or beat up a person in a fashion that is aggressive, unwavering and will most certainly happen.

If you come near my daughter again, i'll Go East Coast on your ass.

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