Fist of Dripping Awesomesauce!

[Zuxius]

You judges find anything like that this year?

[Mikhaila Burnett]

Wherefrom did you get the term "awesomesauce"? That is a word my wife uses that I long believed unique to her...

[Chris Mortika]

Reference from Urban Dictionary and for just "sauce".

[Joshua Kitchens]

According to the Urban Dictionary, it probably started with Strong Bad of Homestar Runner fame. Its been floating around the internet for years none the less.

Edit: And beaten to the punch!