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1.
When one individual behaves in a manner which could be perceived as threatening to another individual, either physically or emotionally so.

See also: Up in my business
"She got up in my face, and I said "Bitch, did you just step to me? You did NOT just step to me!"
by Ry Ry1218 January 24, 2009
 
2.
Acting in such a manner to resolve a conflict.
VANESSA, YOU BITCH. STEP TO ME
by whorescore November 04, 2010