The sauce is an undefinable personality trait that some women possess. It could best be described as sexual confidence, or flirtyness, but it's not quite either. Everyone knows it exsists, but no one really has a name for it, hence the name.
The sauce is very important. As Sizzles law of attraction states: a physically attractive woman who has no sauce, is less attractive than a physically less attractive woman with the sauce.
For an analogy: You could have some of the best egg noodles with no sauce, but they won't be nearly as good as some ramen noodles with awesome sauce on them.
"That chick walked by, said hey, and looked over her shoulder and smiled and winked at me as she passed. That chick has the sauce!"
A double-duece asswhoopin' is a undeniable defeat handed to one person, or group of persons. It doesn't necessarily apply to fighting. It can apply to just about any sort of contest, be it, a spelling bee, a hockey game, a drinking contest, or anything where one can lose.
Be advised: A double-duece asswhoopin' only applies when the defeat is embarrasingly one-sided
The Sharks laid down the Double-duece asswhoopin' on the Detroit redwings with the 7-0 shut-out game!
I laid down the Double-duece asswhoopin' in beerpong last night! My opponent left so drunk he couldn't even remember his name, while I actually had to order beer since he didn't once land a ball in a cup. Everyone was laughing their asses off!