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An improvised street weapon consisting of a billiard ball tied into the toe-end of a tube sock. The implement is swung, generally at high speeds, in such a fashion as to severely injure the victim.
Dude tried to snag my wallet, so I busted him upside the head with my trusty madball. Now he's whistling Dixie through the space where his front teeth used to be.

Also: Sean Penn used a variation of a madball in the classic 1983 prison flick "Bad Boys," where he puts a soda can in a pillow case and uses it to beat the shit out of Clancy Brown.
madball by Jackie Treehorn December 2, 2003
Related Words
A hardcore punk band formed in 1988. The name derives from the weapon, which used to be a common sight at hardcore shows untill venues buffed up security. The current lineup is freddy cricien on vocals(who also happens to be the half brother of roger miret from agnostic front), hoya on bass, mits on guitar, and rigg ross on drums.
yo bro you going to the madball show tonight?

nah man i dont wanna get fucked up in the pit!
madball by jake miller June 22, 2006

mazzallini 

(verb) - (to be on a mazzallini.)
outrageous and in ends it’s a mad one styl.
ay nah that grey ting’s on a mazzallini, she gave me uck in that bush then tried lipsing man.
mazzallini by big man riz January 12, 2020

Mazeballs 

1)Something you absolutely love, admire, or find amazing.
2) something positive, or something someone said or did that caused you joy.
I absolutely love that movie! It's mazeballs!
Mazeballs by Phoenix 13kk June 30, 2017
A muzball is a small, round, fuzzy creature. Able to be baked into small snacks.
Dude, my friend Justin is an absolute muzball.
Muzball by Muzball December 28, 2022

Manballs 

To sack up, or what to say before someone is about to do something gnarly.
Did you see the manballs on that surfing that massive wave?
Manballs by Method411 September 26, 2007