basically the same as sick, like wicked or cool, awesome, what ever you use to desribe something thats great basically.
Yo man, that tune was sickage!
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1. a person who is awesome at something and u hate it
2. another way of saying thats sick but sounds better
3. a man getting fingered up the ass by his girlfriend
person 1:shit hes awesome at football
person 2:ye hes sickage at it
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Same as sick but with more syllables
Astronauts are sickage