Squee is a meaningless word that simultaneously means anything and everything. It is any noun, verb, adjective that the speaker or author intends it to be. Coined by Ariel and Christine last names unknown to be used in any given context. The point of the word is to be substituted for whatever need be. It allows a person to be as completely vague as possible yet still making a point.
"What did you and Amy do last night?"
"She was in a bad mood, so we just squeed."
It is undecipherable what the response means; the couple may have simply held hands or they could have engaged in sexual activities. The listener still can't understand what happened though still receives an answer. Thus 'squee' has successfully served its purpose yet again.