Top Definition
A man's bicep that looks like a boob on their arm.
Dang, Ryan hit the Bowflex again and look at his arm boob! I think it got bigger.
by Eeemly May 28, 2008
5 Words related to arm boob

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.