What is S'n P's?
To be smoking pipes filled with marijuana. This defonition is refered to when the user would rather not directly refer to the meaning of his or her own statement to the public, before or after the action of smokeing marijuana.
The young friend said to the other whilst in front of a parent or guardian, "last night we were just watching a movie and s'n p's". Usually such a statement is followed by laughter or a comment about what they might have meant by what they said.