Octaive
Octaive is when you shut someone up because they're being a total idiot or annoying you so bad you can't take it anymore. You wave your hand like you're slicing their head off while making a long 'eee' sound.
My cousin octaived me when I tried to explain why the sky is green at 2 a. m.
My teacher octaived me when I said 'the moon is made of cheese' in class.
My dog octaived me when I tried to tell him he’s a cat.