Seam Peeper

A person or designer who inspects the seams of garments while in a store in order to gain information about how the article of clothing was constructed.

I think that dirty little seam peeper is checking more than price tags.

prick peeper

That guy who takes a peep at your dong in the urinal.

Hey! Eyes forward ya prick peeper, I'm trying to take a piss over here.

Sleeper Peeper

Someone who takes videos or pictures of another person sleeping.

Ian: (sends video of man head on his arms over a table with his bare feet crossed) captioned: Good Night Prince

Joe: Your such a sleeper peeper lol

Ian: I've killed a man for saying worse, you watch your back guy.