To substitute part of a common word or phrase with the word bro in order to spice it up a bit.
What's up Broseph?
Check out Brobro the clown over here.
Turn your Bibles to Bromans chapter 4, we're going to be talking about the faith of Abroham.
Looks like it's time for bro and tell.
Bro, why are you talking like that?
I'm just bro subbing Bilbro baggins, don't tripskies.