NP

"No Pennies." What you say to a cashier when they are about to give you your change indicating they can keep the pennies.

Cashier is about to give customer change for purchase. "NP."

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ping

Send a very short electronic message to someone. Based on the ping network utility program that sends a small packet to a server across the network to see if it responds and is online.

If I'm in Detroit this summer I'll ping you.