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?
Susan: That's arm porn, honey. Want to watch it again?
by Ragna July 22, 2008

When you play the bass guitar so much that your strumming forearm actually gets bigger than the other. Sometimes confused with Muscular Forearm Syndrome. Sometimes cause by both.
I.E: "Dude, your arm is huge! You need to lay off that masturbating!"
"No man, I play bass, i have Bassist Arm..."
"Oh, that's what you call it... perv."
I.E: "Dude, your arm is huge! You need to lay off that masturbating!"
"No man, I play bass, i have Bassist Arm..."
"Oh, that's what you call it... perv."
I.E: "Dude, your arm is huge! You need to lay off that masturbating!"
"No man, I play bass, i have Bassist Arm..."
"Oh, that's what you call it... perv."
"No man, I play bass, i have Bassist Arm..."
"Oh, that's what you call it... perv."
by benashyton January 12, 2009

Hover arm is the thing you see when a nerd or loser take a picture with a person of the opposite sex, their arm hover over the female's shoulders as the nerd and or loser thinks women are a mythical creature that can't be touched.
by gofuckingdiepewdiepie May 4, 2014

When someone with an excessive amount of arm acne continually squeezes and picks at it. The resulting scars and marks give the impression of the stripes on a tiger. Occurs mostly in the upper arm areas.
by PorschMonkey April 9, 2014

two (or more) countries who try to outdo each other in developing the most sophisticated and or powerful weapons, typically as matter of national pride.
related words: wordspace race/word, wordpatriotism/word
related words: wordspace race/word, wordpatriotism/word
During the Cold War, the US and Russia built up extensive stockpiles of nuclear weapons in an arms race.
by ElPocoBiadlo October 26, 2003

Someone who has the marks/scratches/scars on their arms that would cause someone to see them as a emo cutter. The person of course may not be an Emo cutter, but just have the arms that look as though they are.
That guy looks like he has emo arms but really he was just out in the weeds and got all scratched up.
by E Dellz July 13, 2009

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.
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.
by mr. bigglesworth III October 4, 2009
