Aweomsness, is a typographical error of the word Awesomeness (pronounced: "Awesome"+"ness")
It is commonly sighted in online messaging services such as Windows Live Messenger (MSN) when someone is emphatically expressing their emotions about a certain event or object.
JOHN: Did you see how fast that supercharged commy was going down the main street last night???
FRED: shiz yerr zomg tht was friggen aweomsness!!!1