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Common irish slang. Comes from 'mad'. ( In ireland if you are daring and cool you would say 'your mad!')

Term used to describe pathetic dopes who THINK they are the most extreme coolest impressive thing ever.
' niamhs off smoking with the older kids, cause she thinks its cool '

'yeah she thinks she's shmad...'
shmad by humancd February 1, 2009
Related Words
when you feel sad mad and happy all at the same time
girl “dang i feel shmad now that i finally told him off”

bsf “yeah but you did the right thing.. plus you’re still sexy as hell
A commonly used word in Ireland referring mostly to teens who think they're the shit for drinking and smoking and getting up to other teenage shenanigans. Spoof of the word 'mad' meaning 'crazy'. A person who does 'shmad' stuff is called a 'shmadster'.

Little rascals...
Boy 1: Ye goin gaff party tehnoih?
(i.e - Are you going to the house party tonight?)
Boy 2: Nahh goin field wihh dahh m8s, guna geh smashed coz we r 'shmad' loike!

(i.e - No, I am going to a field with my friends, I will be getting severely drunk because I am 'shmad' like.)
Shmad by KnightsOfNih March 8, 2011
N. Or Adj.: The dick cheese under the foreskin of a penis.
I didn't go down on him because of his shmad.

You're being a nasty piece of shmad.
Shmad by Whaidn November 15, 2017
I am shmad at Megan
Shmad by ShappyJerry September 16, 2014

shaddafuckup 

This is the reply one should use when some idiot attempts to tell you how you should do something you already deal with on a regular basis and that they have never experianced and know nothing about.
Mr. Knowitall was once again getting on everyones nerves by telling them how they should complete the job when one individual shut him up by blurting out, "shaddafuckup".
shaddafuckup by jpg3 May 11, 2011