Another name for the penis, also can be used as a derogatory term for a friend.
A. Hey Dude, do you want to go out to the bars tonight?
B. No thanks, I think I'll stay in and chat with my girlfriend.
A. Fuck that, dude. That bitch has a vise grip on your nutsack. Quit being a beefdart and come hang out with us.
B. Sorry, I can't. she gets mad at me when I miss our AIM dates.
A. You're such a fucking beefdart. Why don't you grow a pair?
BEEFDART:another word for penis or dick. also one of those words that just make people laugh when you say it, because they have no clue what it means.
guy-1: ball taps guy-2
guy-2: your such a fucking beefdart! why u gotta go and ball tap me