Definition of "STP"

STP

noun
countable and uncountable, plural STPs
1. Initialism of sewage treatment plant.
2. (physics, chemistry) Initialism of standard temperature and pressure.
3. (networking) Initialism of spanning tree protocol.
4. (electronics) Initialism of shielded twisted pair.
5. (especially LGBT) Initialism of stand-to-pee.
6. (uncountable, slang) A hallucinogen (2,5-dimethoxy-4-methylamphetamine), chemically related to amphetamine but with LSD-like effects.
  Quotations
  “Don,” she cries, breathless. “We got some STP today.” At this time STP is a pretty big deal, remember; nobody yet knew what it was and it was relatively, although just relatively, hard to come by.
  1968, Joan Didion, “Slouching Towards Bethlehem”, in Slouching Towards Bethlehem
  I could not correctly estimate what I was experiencing, and the strychnine in the STP began cramping my belly.
  2021, Rickie Lee Jones, Last Chance Texaco, Grove Press, published 2022, page 128
adjective
1. (construction) Initialism of subject to planning.