Sims 1+2+3 term of endearment. means "baby" in Simlish. When a Sim is about to give birth, they yell "nooboo!" They also often coo the word at their babies.
when you are a chad who had a dad named Brad and you're watching an ad on your iPad with a british lad who's singing a ballad and you're really mad, sad and bad
The british lad: Oi mate, you want some crisps, eh?
You: Noooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
Brad: My child...
You: Dad?
The british lad: Who the fook is this twat?