"S my P" is a discrete way to let someone know that you Shit your Pants. It is for
people who are either ashamed of their activity or want to make light of the situation.
However, "S my P" is not to be confused with "S my D," which refers to Suck my Dick or "S my C," which refers to Suck my Clit. This should be easy to keep straight in your
head because no
one says, "Suck my Penis."