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1.
Phrase meant to show indifference if another person (usually of the opposite sex) calls you, but is very much the opposite.

Means one of two extremes-
1) - Call me immediately, preferably tomorrow or later today

OR

2) - Don't call me. For any reason. Ever.
Girl- "Call me sometime, k?"
Guy- (Is confused trying to figure out of it means call me right now or don't call me ever)
by ACG2x December 01, 2004