Specifically, when a person or persons do something standard, pre-destined, or downtright natural to their character resulting in often humourous or extreme concequences.

Cosmo: Man, Noemie just slapped that bouncer in the face!
Harky: Wha?!! ha ha Cardboard Classic man, she's getting bounced... I'll get her shoes.

or

Orlando: Oh S**t! what you gonna drop on that deck next Harky?
Harky: Man, watch this tune, it's a Cardboard Classic, everyone's gonna go off
by Harkyharky February 27, 2008
Get the Cardboard Classic mug.