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To urinate into the ear canal, especially as a prank while the victim is sleeping or otherwise incapacitated.
Jane got too drunk at the party, passed out, and was pispered by John. She said it felt like a wet willy, but even being teabagged would have been less humiliating.
To piss silently against the side of the toilet in order to compensate for a friend's lack of noise insulation in their apartment.
You should try to pisper next time, everyone at the party just heard your Niagara impression.