Reiro's definitions
It means "stop passing the pepper" or stop being awkward so as to make any situation (awkward or not) even more awkward.
When in an elevator with someone you don't know:
Person 1: "Stop passing the pepper or SPTP."
Person 2: "..."
Person 1: "Stop passing the pepper or SPTP."
Person 2: "..."
by Reiro March 31, 2010
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