1. An exclamatory phrase used to convey happiness when things that rock happen.
2. The opposite of weaksauce.
3. Concentrated rock awesomeness, refined futher through the wonders of science, to produce a substance so mindblowingly awesome that merely invoking it by name increases the amount of rock n roll in the universe.
Wow, I just found an original press of {awesome band}'s limited 9" for a fucking dollar! Rocksauce!
Guy A: See that girl over there?
Guy B: You mean the girl that looks like Sarah Silverman reading the Bertrand Russell book?
Guy A: Yeah, her. I shit you not man, she told me to tell you she wants your number...
Guy B: OMFG ROCKSAUCE!
Parking in front of a building not in a parking spot, and blocking traffic. This does not mean finding a spot that is close, it means blocking traffic in front of a building. Only rock stars get that special treatment. Throwing something at this car is permitted as they aren't special.
Marcus didn't want to park in the parking lot so he decided to Rock star park right in front of the store and block traffic.