When you're high af but you said that you'd quit and your friend finds out so you reply with "oof"
An example of a high oof would be:
Friend: Hey, Jay! I thought you'd quit that weed!
Jay: *looks around nerously* Oof.
Oof: For when you literally have nothing useful to say
Friend #1: I'm high af.
Friend #2: Oof.
Friend #1: Imma go a wafer * :) *a while.
Friend #2: I hate you.