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1.
When two guys are always hanging out together and spend all of their time together in a non-homosexual way, yet their relationship is borderline homo. At parties they are always sitting on the couch together instead of beating up the beat.
Elizabeth: "Brian is really cute, would you mind getting his number for me?"

Todd: "Trust me he will never give you the light of day, he's blow bros with John. They can never be separated."
by C-dizzledazzle March 07, 2010
 
2.
The equivalent of Eskimo bros, but pertaining to oral sex. When two men receive oral sex from the same girl. But not simultaneously.
"Josh and Sam both got head from that Sadie girl." -Tanner
"So they're blow bros?" - Braeden
by B-lukky October 10, 2013