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Person 1: I had some Mad Chill cheese fries today.
Person 2: Nice
A very annoying and stupid phrase used to describe someone or something very cool.
- "Dude, this kid I know is mad chill..."

- "What the hell is with all this 'mad chill' crap that everyone keeps repeating?"

- "Well, uh, it's just a new thing everyone is saying..."

- "Can you think for yourself for once and not use such a stupid phrase and stick to something that isn't so retarded?"

- "Dude, you're being an idiot..."

- "'Dude', please don't call me 'dude'... and I'm not the one whose saying 'mad chill'"

- "..."

- "That's what I thought..."
Mad Chill by AnPiarsach June 12, 2009
Being in an environment where there is a chilly anger.
Whoa, There was a mad chill going on in my youse tonight.
Mad Chill by Cy Hand December 20, 2003

Mad Chillin' 

applies to any situation in which one is in a very relaxed, nonchalant state of being. This state of being is usually the result of a)being overworked b)giving up hope of success c)legitimately taking a rest d)under the influence of something e)just plain ol' lazy

Can also apply to non-human entities or other objects.
1. "You failed the quiz!?" "Yeah bro I be mad chillin' on studying."

2. "I asked my friend to pay me back but he's mad chillin' aka not even sweating it."

3. "I missed your call because my phone was missing.

Found it mad chillin' on my bed."
Mad Chillin' by stefikins15 February 25, 2010

Madchillin

Means "just chillin" or to be "super chill" in a very extreme way. A common word for stoners because they're stoned. Example: "Hey bro what are you doing after school today" "madchillin"
"Hey bro, what are you doin after school?" "Nothing much, madchillin, you know"
Madchillin by Miguel Carllos October 24, 2014