I'll get my coat
A lie someone tells to escape a situation where they’ve been roasted so hard they think they might need a coat to survive the shame.
'I'll get my coat' after his friend said he smelled like a f***ing garbage can.
'I'll get my coat' when he said his crush had a bigger nose than a f***ing elephant.
'I'll get my coat' after he tripped over his own feet during the school talent show.