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1.
While the S can have varing terms it generally means
Slip it in her pooper, however the S can mean, Stick, Shove, Slam, Sneak, or Stuff
Person A - You going out with that chick tonight?
Person B - Yeah
Person A - Don't forget to SIIHP
by Garret Werstiuk May 06, 2006
86 26
 
2.
Acronym for "Stick it in her"

if you can't figure out the P part, you'll probably never use (or experience) this acronym anyway.

Who cares if it's "that time of the month", I say go ahead and SIIHP
by Jeffrey Ross April 26, 2006
21 70