Abbreviation for Calmer Than You Are (CTYA). A definitive way to end a debate.
The most likely origin is from the character Walter Sobchek, in 'The Big Lebowski.'
Eric: "I don't care what you say; Lance Armstrong is a better all-time athlete than Michael Jordan! He has seven . . "
<< interrupting >>
Jon: "Calmer than you are." or "CTYA."
Eric: "Yeah, I suppose."