Obro
Obro is like saying 'on bro' as if you're giving someone a blessing. The O is 'on' and the bro is just there because bro is cool and everyone likes bro.
I’m giving you Obro, bro. You’re welcome.
On bro! That’s what I said when I gave him the worst deal ever.
Obro is the best way to say 'on bro' without thinking.