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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.
best mate by spunko2010 October 23, 2006
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me best mate 

Someone who’s shit you put up with cause you know you can always count on them.
This is me best mate got some strange ways but a heart of gold, can always count on her/him
me best mate by Blueford December 31, 2018

bestimate 

when you're giving your best estimate about something
I'm not sure when she will arrive, but I'll give you my bestimate.
bestimate by Kevin Kusreau January 3, 2007

bestmated 

When it gets to that time of night, usually around 3-4am, and everyone is seshed up and been really nice to each other. This is also commonly known as 'licking each-others arses'. Best-mated differs from this because you are that drugged up and walking round using phrases like 'you lot actually are my best-mates' or 'just wanted to let you lot know that you are all proper nice people and i love you all'. When you see someone doing this; you can describe them as 'bestmated'.
'Look at Jimmy! He's bestmated!'
bestmated by pyurpyur August 22, 2017
Somebody that is kind frindly and happy to be with u
"You are my best mate"
"Thank you bezzie"
Best mate by Sassy bitch May 24, 2016

Bestmane 

Bestmane a twitter meme titan belonging to the BAKAGANG set
Bestmane is a sussy baka
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!!
best mate by sugarcoatedme December 8, 2011