To impress, astound, or entertain someone. To "kick ass." The phrase has its origins in the Bon Jovi song "Wanted Dead or Alive," which contains the unintentionally funny line "I've seen a million faces, and I've rocked 'em all." The phrase was popularized by online humorist Seanbaby, whose website boasts "over 40 million faces rocked!" It seems Seanbaby heard the line in the Bon Jovi song, thought it was funny, and made it his own.

The phrase has since found its way into online dialogue, often used facetiously or ironically (similar to modern use of phrases like "stick it to the Man!"), due to the consciously silly nature of the phrase.
"I've seen a million faces, and I've rocked 'em all." --Bon Jovi
"Over 40 million faces rocked!" --
"This action movie is great. It's gonna rock your face. Hard."
by The Huntsville Horror June 2, 2006
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To do somehthing better than someone else. To empress somebody to a large degree
I am so good at the Olson Twins board game. I am going to rock your face off.
by funkmastah9 August 12, 2003
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1) A play on words, encapsulating charismatic flair in a flirtatious and sultry nature via metaphorical innuendo -- backing you up and drawing you in... all at once.

2) The act of someone impressing, astounding, or entertaining another -- more of an art than a skill...

3) A phrase coined by Jami, queen face-rocker.
"Bringing me an iced tea would totally rock my face right now..."

"Join my army of face-rocking minions and start rocking faces today!" -- Jami,

"Now that I have the new iPhone, I rock your face!"
by i ROCK your face! September 16, 2009
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Getting beyond hammered with your friends blasting awesome music
"Hey what are you doing?"
by 123454324 August 17, 2011