When you loosely agree to attend something with no intention of attending. Eg not a good Man
He's Doing a Goodman he hasn't shown up
Making extravagant and wildly inaccurate or inopropriate claims.
Statements such these would be considered doing a Goodman.
‘I’m the people’s champion’
Or
‘I’m in the top 3’
Or
‘People mistake me for a fitness model’