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2.
The english/british term for best friends.
Prince Harry and Prince William are best mates.
by CaliPatsFan June 21, 2008
5 3
 
1.
Chiefly British English.

That one person in your life who is like a sibling. You'll do anything for them, literally. They understand you, you understand them and you're always happy when you're around them. You just click.

Similar to best friend, but you can only really have one best mate, otherwise they are probably just good friends.
My best mate is like a brother to me, and I hope we are best mates for life.
by spunko2010 October 23, 2006
54 7
 
3.
Best friends that are also room mates.
(phone rings a super mario theme)
Hello?
Hey!
Oh best mate what is going on?!
You need to check out this bullet..
Sorry, I can't right now.. I'm on my way to a nooner!!
by sugarcoatedme June 11, 2011
2 3