To over emphasize the awesomeness of something. A contraction of the word awesome and cool, effectively combining the two words.
That was so awesomecool dude!
Some moronic way to say "awesome" and "cool" while kicking the English dictionary once again.
Typical user is an overexcited 12 year old AOLer.
THAT WAS AWESOMECOOL DUDE OMG OMG (add l33tspeak).