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4.
A friend that bails on plans.

A designated drive that ends up drinking.
A person that moves cities for no apparent reason
A close friend that blows you ex in a club toilet.
You are a SHIT MATE
by shitttttmatttteeee June 21, 2011
 
1.
Callum Blair
When you invite a mate round for chills and thrills, and then he decides to ditch you for bigger and better things!, thus becoming a shit mate!
by Jevs92 May 09, 2010
 
2.
shit mate is what you say when you are surprised to one of your friends.
Michaela: i saw barnsey last night.
Ashleigh: shit mate
by titsmageekayzee October 17, 2008
 
3.
1. Someone you maintain a friendship with whoes deficiencies boost your self-esteem.

2. The member of the group always cracked on and ridiculed.
Homie 1- Yo son your boy is morbidly obese.
Homie 2- No shit hes just a shitmate.
Homie 1- You got issues G.
by Mo Green April 02, 2008
 
5.
When two or more coworkers experience horrid work conditions, esp. Navy. Replaces "shipmate" with "shitmate."
*Word comes from above that the weekend has been cancelled*

"Well, looks like we are going to be stuck here yet again, shitmates!"
by rukasu_01 May 14, 2014