I yeah - You say it when you know someone is lying, but you just let

You say it when you know someone is lying, but you just let it slide because you’re too lazy to argue.

'I got a perfect score on the test.' 'I yeah, and you probably got a D.'

'I got a date with the mayor’s daughter.' 'I yeah, and she’s still dating the mayor.'

'I’m the best at video games.' 'I yeah, and you’re still getting beaten by a kid.'