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1.
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: The one that looks like Natalie Portman 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: ROCKSAUCE!

by D. Ronin March 30, 2006
 
2.
Something that rocks so much, and is so cool , that it is practically oozing Rock Sauce.
Wow, that car is rock sauce! I want one.
by ihatethemboth November 24, 2006
 
3.
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!
by D. Ronin April 09, 2006
 
4.
A take off on weak sauce. It implies something that can be classified as a type of sauce. Rock, taken from Rock-On, should be obvious as to its meaning. Therefore, Rock Sauce, is sauce that is cool enough to be in the same genre as Rock n' Roll, or other Rockin' phrases (bitchin', ownin', or other words that end in " in' ").
Idiot: "So i was trying to think of a phrase to say how (insert lesser adjective) the concert was last night, but there just wasn't any word (adjective) enough to describe it. The band gave out signed guitars and there was free monster energy drinks all night.

Friend: Man, you should have used "Rock Sauce".

Idiot: Do'h!
by Miles-Erik July 17, 2006