Part of the incoherent string of words uttered by Vicky Pollard of Little Britain - and those in England who are like her (of which there are far too many)
Teacher: "Vicky, do you have that essay for me?"
Vicky: "Yeah but, no but, yeah but, no but, yeah but Keanu stole it from me but thats nothing because he fingered Meredith on the swings round the back of the school..."
This word (Bro Yeah, No) is simply used as a way of disagreeing with someone usually a (BROTHER)
There is a slight pause between BRO YEAH and NO
1. Man 1: Your Mum is a MILFSHAKE
Man 2: (Bro Yeah No)
2. Your Mum is a GUNI GU GU
(Bro Yeah No)
3. Man 1: Your mum is a hippo
Man 2: Bro Yeah No
4: Man 1: Is you a batty boi
Man 2: Bro Yeah No