another way of looking at it might be "dishonest tackiness" Joan Rivers is Tacky because she doesn't pretend to be otherwise. Celine Dion is cheesy because, while she is every bit as tacky as Ms. Rivers, she is trying to convince the world that she is cool.

Cheeze in a can is cheesy because the "z" is there to fool stupid people into thinking they are eating cheeze.

Whipped topping in a can is merely tacky, because no one is being asked to believe that they are eating whipped cream.