To enjoy music excessively, often while operating a motor vehicle. Rocking out often occurs at a stoplight and can be impulsive. Rocking out often involves playing the air guitar, air drums, and the air tambourine. The alleged rock out star usually plays every instrument in the song at least once. It rarely goes unnoticed.

There have been no reported deaths from rocking out.
Dude, I totally got caught rocking out in my car today.
So? It happens
I was listening to Ace of Base...
Ooooh snap!
by airbag22 October 31, 2006
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Listening to some ill beats on your jam box while headbanging (lightly or heavy) and taping your foot, maybe even signing along.
Dood! You rocking out to a friigin country song!
by Kevin Shaw September 6, 2005
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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
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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 18, 2005
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"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
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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.
by Natey G July 9, 2004
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