A fork of Rural Dictionary
What you get when you someone slightly touches your arm. Your arm then proceeds to tense up and flings straight up in the air.
Alaura slightly touched my arm, and I got an arm boner! I broke his nose!
A semi-hard erection...soft, yet firm like a baby's arm.
She could have really had me going but since we were out at dinner, her foot play only gave me a baby arm boner."