Pissing in a person's pocket means to insincerely attempt to convince a person that you're doing them a favour, when you actually have only your own interests (generally either making a profit or ingratiating oneself) at heart.
i.e. You are pissing in a person's pocket, and trying to convince them that you're doing them a favour by warming their pocket. But realisticly all you're doing is soaking their pants in urine.
"That salesman was a complete dickhead. Constantly pissing in my pocket, trying to tell me how much I needed (insert product here)."
The art of stealthily putting your dick in someones pocket and urinating in it.
Basicallypick-pocketing but in stead of stealing, you're giving them something
Man, the bus was super crowded today, AND some bastard piss-pocketed me! (Piss-Pocketing)
noun - term used to describe a female after a male has urinated in her womb in order to relieve spermatazoa build-up pressure within his prostate, allowing him to continue coitus without orgasm.
not to be confused with the "bronson hotpocket", the term used to describe a form of anal sex and involving urination.
noun - as spoken, "that girl is garys pisspocket, because he doesnt like the feel of condoms, and shes catholic."