Major league

You can't be so casual. You're in the major leagues now.

That rock band is really major league.

Calatrava is a major league architect.

The company made a major league effort to get the contract.

Bill accidentally faxed sensitive documents to our competitors, and such a major league mess-up could only be dealt with by firing Bill.

[…]I'm experiencing a major-league anxiety attack, searching my pockets for Valium, Xanax, a leftover Halcion, anything, and all I find are three faded Nuprin in a Gucci pill-box, so I pop all three into my mouth and swallow them down with a Diet Pepsi and I couldn’t tell you where it came from if my life depended on it.