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1.
Where you are compulsed by the total arse-kicking-ness of a song (mainly rock and metal) to go ballistic. This can include air guitaring, jumping around, showing the horns and generally making a tit out of yourself. But it's ok, cause you're ROCKING OUT!
* Riff Raff by AC/DC hits *

"ROCK OUT!!!!!"
by Mooman August 27, 2004
202 40
 
2.
to listen to or play music to such an extent that the mind begins to lose consiousness and a new, more insane alter ego takes control
Dude, he's rocking out!
by yasmin August 03, 2003
112 22
 
3.
said when an individual has to leave one or more friends abruptly.
"Sorry guys, I got to rock out. My girlfriend just called and told me to come over because her parents just left.
by The Dingo February 17, 2005
58 46
 
4.
1. The act of enthusiastically listening to music of the genre rock and roll

2. Public display of crack cocaine
1. I'm gonna go rock out on some ACDC

2. dude yo left yo rock out!
by TomWaxman July 16, 2010
11 4
 
5.
"with your cock out"

This usually entails drinking copious ammounts of beer, turning to the neerest available "mate" and exposing ones genitals to the elements, whilst "throwing up the horns" (common Rock music gesture).
Synonimous to "Hang out with your wang out"
and "having your penis outside of your pants and looking like a douchebag" (thankyou Ryan).

The "rocker" is usually the subject of much humilliation during the following days/months/years etc.
-"Hey did you hear what Jack did this weekend? He got like totally trashed and showed Russ his dick!"
-"what the hell really?"
-"yep, he rocked out with his cock out"
-"haha! ROCK OUT!!!"

-"WHAT THE HELL JACK!! WHAT THE HELL!!!"
by Spriggen_nick August 17, 2007
34 27
 
6.
"Go crazy"
"Man that guy really likes to rock out"
by Gary January 20, 2003
29 32
 
7.
To reach a state of inebriation where one looses track of all time and space. Usually involves mass quantities of beer, one's best friends, and drinking until sunrise.
We should rock out next weekend!
by Natey G July 08, 2004
20 35