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Used for emphasis much like "psh" or "what whatttt". Its founder is the late ODB (RIP). This word is mainly used when dealing with skanks, ho's, bitches, sluts, haters, and in rare cases even teachers (she must be a raging bull dyke).
ODB: Nmph! Baby Girl now gimmme my money!
Gangbanger: Girl get over here and park that ass on me, Nmph!

Teacher Reference:
Evan: Damn Eileen you gimme one more B and I'll split your wig! Nmph!
by KillACommyForMommy April 11, 2005