A statement made my someone after listening to a person say something completely disinteresting, boring or unnecessary. A possible substitute for cool story bro nobody in the conversation needs to be called Kevin.
Person 1 - So I had a really productive today of hoovering the living room, cleaning the bathroom & walking the hamster.
Person - ....Cheers Kev
When someone says something very boring or completely irrelevant say to them "cheers kev"
Kieran: Wish I wrote a diary when I was younger
James: Cheers Kev
Cheers Kev is a statement used when a person is telling an uninteresting anecdote or sharing their unwelcome opinion that nobody really cares about. It is said at the end of said anecdote or unnecessary opinion as to say, 'Thanks you wanker. I really needed to know that you class A prick.' albeit more politely.
'Your wife would look less like a dog if you made her wear makeup mate.'
'Yeah... Cheers Kev.'
'My dog learned to sit last week. I'm so proud of him. He's so smart etc etc!'
'So interesting! Cheers Kev!'