A:I got a new book to read.
B: Coolioes.
Coolioes was used here because
the event isn't very exciting.
A:I got a new game!
B:Cool!
Cool was used here because
the event was exciting enough.
Using "coolioes" in a sarcastic way
A:I got a new yak!
B:Coooolioes.
This is why we don't use coolioes in a sarcastic way, because when you say it
sarcastically it sounds like a fat bird.