https://www.urbandictionary.com/define.php?term=PnP
Seen most often in the gay community, slang for Party n' Play. Party refers to drug use- most often meth (tina, ice, crank) but sometimes ecstasy (E, XTC, Adam) cocaine (coke, blow, ski, snow), or poppers as well(though the latter is not generally considered a PnP item. Play refers to sex. PnP is considered a scene in itself- sex and drugs.
Or:
PNP
adjective
ELECTRONICS
1.
denoting a semiconductor device in which an n-type region is sandwiched between two p-type regions.