Someone thinking they're all that;When one thinks they're of higher authority/importance than they are; acting like the legend only you believe yourself to be!
Did you see that bloke? Giving it all that, thinking he's the big 'I am'?!
"So I'm there, giving it the big 'I am', and then I realize I've got nothing to back it up with!".
Get on with something; just do it
I really fancy this guy and I need to do something about it so I'm just going to get on it.
I've still got a hangover and I think the only way forward is hair of the dog, I'm just going to get on it.