Abbreviation for Standard Highschool Party. With all things including drugs, alcohol, and sex. With a shit load of people trashing ones house. Everyone can come because no one cares.
Originated in a small town of Georgia by this blasian chick who threw the fucking craziest party ever.
Common use for it is writing down SHP at the bottom left of a flyer.
"SHP at this chicks house, everyones invited!"