What is this, every year since BroodWar came out? Maybe even since WarCraft II?
Cheese: An early game strategy that relies on the opponent not gathering enough scouting information in time to work OR an unorthodox strategy that relies on catching the opponent off-guard to win.
So it's cheese if someone walls off their main and uses deception to beat their opponent? That's standard play. You're not supposed to let your opponent see what you're doing. If they do, you'll get perfectly countered by a smart player. Your definition has been boiled down to 'an unorthodox strategy.'
I think more people agree that cheese is when you do something incredibly risky without regard for your opponent. For example, building 2 gateways in the centre of the map before scouting, or 5pooling. Even then, it's kind of debatable.