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1.
the term "go between" or "go-between" refers to a person who is utilized by two or more people as a messenger or conduit of information despite the fact that the information does not pertain to him or her.
Go Between: Yo bitch-ass friend keeps using me as a go-between, can I get paid for dat?

Asshole: Can you tell my friend I said to kiss my ass for me, dogg?
Go Between: Hell naw!!
Asshole: You fired.
Go Between: I never got paid.
by The Friend of Da Go Between March 13, 2005
 
2.
A thong type garment worn by a male
called a go-between for its nature of going between the testes.
by cheoffrey October 28, 2010