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1.
When two men hang out constantly and refuse to admit their longing to have the others genitals in their mouths. So basically, it's the manlier version of a "bromance."
Yes, I would love to do the dutch rudder with you! We're besties with testes!
by misterlovahlovahooogirl August 12, 2010
 
2.
The term used when a female has a male best friend or friends.
T: I love M, he is one of my Besties!

N: He is totally one of your Besties with Testes.
by Kookookachooahahachoo May 03, 2011