STP 

San Diego Landscaper, marathon runner, and all around good guy. Once was lost, saved by an angel named HED.

Damn Gina! Did you see STP order off that Japanese menu? That a lot of food!

STP by Beast24 December 2, 2009

STP 

Scientifically Tested Petroleum®

Petroleum company which makes products such as oil treatment and fuel treatment for automobiles.

Official sponsor of Richard Petty and the number 43 Plymouth NASCAR machine.

STP by Bitchin Kitchen August 15, 2003

STP 

STINKY TOILET PAPER

DARIN THINKS STP STANDS FOR STINKY TOILET PAPER

STP by 0U812 December 16, 2008

stp 

slap that prositute

That guy stp in the street late last night

stp by Wendix January 22, 2011

STP 

An old adage from the 1960s to the 1980s, during the Indianapolis 500 glory days of the partyin' Snake Pit in Turns 1 and 4, meaning to "Start The Party." Of course, this was before the evil Tony George took over the Indianapolis Motor Speedway and made it family-friendly.

Hey Joseph, when will they STP during the month of May at the Speedway?

STP by L. Smitherman June 13, 2007

STP 

Sexually Transmitted Poop

"Dang...that boy's grimy. Hes got some STP."

STP by Eva Martin March 11, 2010

stp 

the craziest fucking drug ever took one hit and i was naild off my trolly

i went to the carnival on stp

stp by MRmerc April 23, 2006