Ok final answer.

NOSTR (notes and other stuff transmitted by relays)

The “O” stands for other making the uhh sound, in turn making it nuhstr. However many words in the English language have a silent “s” in them. I believe that is the case here, making #NOSTR pronounced 
“NUTTER”
🤪 nostr:note17rfzpaj0d5d3vrxrtpmw2mjgzp8z5qmraugyf97ap23syuvmf79sfkgpz6