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adjective similar to "1337" but specific to the actuarial profession. A word to describe something as incredible, amazing, great but in an actuarial context. This word was created in honor of the legendary candidate 453, who was the only candidate to pass casualty actuarial exam 7 in the Spring of 2011.
That loss development factor is 453!
If I pass my next actuarial exam, that would be really 453!
by oathlisten2 June 24, 2011
text talk or shorter version for "cool story bro" similar to 143 for "i love you."
person 1:"Sometimes i like blue, but then again i like purple too!"

person 2: "453..."
by my naymz jakub October 20, 2011