Blood Bro
A literal bro. Your mother's son who is not you. Used to distinguish between a bro and a brother.
John - Dude, David's my bro.
Jim - Wait really? I didn't know that.
John - ... What do you mean?
Jim - Ooooh you mean "bro." I thought you meant a blood bro.
John - Nope. Just a bro.
Jim - Okay.
Jim - Wait really? I didn't know that.
John - ... What do you mean?
Jim - Ooooh you mean "bro." I thought you meant a blood bro.
John - Nope. Just a bro.
Jim - Okay.