In much the same way that "awesomesauce" modifies "awesome," epicsauce is the proper modifier to use when "awesomesauce" just isn't enough. It is epic to the power of ten.
-I just saw the Cloverfield monster and Godzilla duke it out!
'epicsauce' is used to describe anything that's really cool, or epic for that matter. Technically, you could just use an adjective and 'sauce'. works just as well. Like coolsauce, or failsauce.
"Whoah, hey man! Cool guitar!"
"Yeah I know, it's sprinkled with epicsauce."