I Dey Laugh O - IDLO is when you're laughing so hard you can't breathe, and

IDLO is when you're laughing so hard you can't breathe, and you're also calling the person a total dummy.

My classmate said he's going to be a doctor. IDLO.

My dad said I'm going to be poor forever. IDLO.

My neighbor said he's going to be a billionaire. IDLO.