perv

noun2

1. •
   (slang) A pervert.
2. •
   (UK, slang) An ogle; an act of leering or voyeurism.

   • After the next ball had been bowled the blokes' heads would turn around unobtrusively to have a perv at a bird in a mini-skirt... — 1974

verb2

1. •
   (slang, disapproving) To act in a sexually perverted manner.

   • God, could you stop perving out over my sister? She's literally 14.
2. •
   (slang, disapproving) To look at lasciviously or voyeuristically.

   • The soccer coach perved on one of the players as he undressed in the change room.

noun1

1. •
   Acronym of porcine endogenous retrovirus.