Have you ever seen the term 'SQUEE' in an Internet post? It is usually written in all caps with multiple exclamation marks following, for example: 'Santa is coming tonight! SQUEEEEE!!!!!' I suppose it approximates a squeal-like sound. The example below is a bit unfortunate though.
Kind of spoils Easter, doesn't it? I certainly don't want to eat, or even touch, any eggs the poster may have squeed on! Moral: use all caps and plenty of exclamation marks after the term to avoid confusion and general horror.