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To be on a mad one=to be going crazily angry at no apparent provocation
Seán: Can I have a pencil please Miss?
Miss Griffin: No Seán, go and buy your own f*cking pencils, you little b*ll*cks.

Seán(to friends):Jesus lads, don't go near Griffin today, she's on a mad one.
mad one by Jamachine May 23, 2007
someone who acts extremly crazy for attention
person 1:Your mum's a mad one

person 2:get out
mad one by 250107 March 16, 2022

a mad one 

A period of time spent doing nothing that isnt completely silly, hopefully bizarre & enormously fun! Usually undertaken when under the influence of alcohol or drugs or both.

Best enjoyed after (in fact it only really qualifies as 'a mad one' after) at least one night's sleep deprivation.

(It is also worth noting that 'a mad one' is normally accompanied by almost continuous, totally sincere but basically pointless, apologies to anyone nearby who is halfway normal)
"Sorry mate, don't mind us ..we're on a mad one"

"I know I am talking shit mate, sorry, I've been on a bit of a mad one"

that one mad Australian guy in cod 

he said: Do you honestly think you're fucking funny, fucking with my friends? Seriously, you're a fucking ugly little cunt mate, and if I ever see you i'm gunna slit your fucking face wide open yeh? You're a fucking angry little fucking spastic.
that one mad Australian guy in cod says toxic shit

I am Emma in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad 

I am Emma in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad
I am Emma in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad

I am skizzle in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad 

I am skizzle in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad
I am skizzle in the UrBan dictionary to make this shirt and mug because i have nothing else to do anyways so this is for me and no one else and am getting it from here because i am poor so yes this is my shirt/mug stay mad be mad