When you find something hilarious but you don't want to say " this is hilarious" so you say "I'm hilared." This works because you're basically saying " this is so funny" or something close to that. Can be said in a monotone/ sarcastic voice or in a "I'm dying laughing" voice.
Im watching the new episode of one piece, and Luffy does something hilarious. I say "I'm hilared" and laugh.
Someone does something thinking its funny but you don't, "Oh, I'm hilared" sarcasm.
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.