A fork of Rural Dictionary
Pictures/video of a man with well-developed arms while he is in a tank top/wife beater or shirtless. Came about in the CSI fandom after two CSI: NY episodes ("Trapped" and "Cool Hunter") which featured the character Danny Messer (portrayed by Carmine Giovinazzo) in a wife beater.
Amy: Did you see his arms? They're so...so...wow. Susan: That's arm porn, honey. Want to watch it again?
A butch dyke in short-sleeves showing off very well-developed arms with well-defined muscles (but not steroid-type muscle).
Jenny: Your girlfriend has a really nice body. Her arms look really hot in short sleeves. Carla: Oh yeah, I can barely stop myself from drooling. It's total arm porn. ---- Sam (Samantha): Babe, now that I've started bulking up, I'm thinking of getting a tattoo on my arm. What do you think? Laura: Oh baby, that would totally give you arm porn.
An extremely swoll arm that has been shaped through excessive masturbation while watching porn.
Ex.1 Guy 1: Have you noticed John has a really strong left arm? Guy 2: That's because his left arm is his porn arm Ex. 2 This porno you gave me is giving me a porn arm.