Like a bro, but way awesomer.
Not gender specific.
Wallace: "Oh yea, Sean. Are you and Sean boiz?"
Nate: "Yea, we're totally boiz."
Wallace: "Naw, I don't believe you."
Nate: "Hey Sean, are we boiz?"
Sean: "Yea Nate, we're totally boiz."
Wallace: "Dude, I thought you were boiz with me!"
Sean: "I AM boiz with you Wallace. You're both my boiz."