a ribald head turning practice where a guy flashes his ding dong to other people for amuzement, disruptive intent, to get attention or just a plain and simple gesture of defiance, contempt and rebellion. The left hand is on the willie and the right one can flip a bird, give a V or some other fuck you gesture. Sneering is optional.
1. I saw on PBS a miniseries about the history of rock'n'roll. On the episode about proto-punk there was a show by the Stooges. Iggy Pop reached into his short silver pants and stunned the audience by exposing his sex pistol and doing the rattlesnake shake. He was rocking out with his cock out.

2. the outgoing governor of Florida worked feverishly to give a pardon to Doors frontman Jim Morrison for rocking out with his cock out during a gig sometime during 1969 - 1971. The pardon was granted.

3. On the track "Rock Out" on the 2008 Motorhead CD "Motorizer" Lemmy exhorts you to impress your lady friends by rocking out with your cock out.

4. Trent got busted by the cops when he flashed his weenie at every neighbor who was home. He said to each of them, "This spud's for you" and walked on by. Not everybody wants you to rock out with your cock out.
by I Saw U2 Live Twice August 31, 2011
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when listening to hard rock while performing sexual intercourse with ones partner, the male will disengage, assume a rock start position (for example take a knee), and proceed to play his penis as if it were a guitar during a solo; the same may be done for the opposite sex if her clitoris is longer than two inches in length
"Dude, last night while bangin' my girl a wicked guitar solo came on the radio!"

"Aw man, did you rock out with your cock out?"
by Noidsifsif August 31, 2008
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to not care what others think of a situation.
"dude, that asshole in the other cars flipping you off! Fucking crash him!" " Nah, ill just rock out with my cock out"
by ethan bernard May 2, 2008
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Basicly this entails listening to metal or hardcore in you or a friends living room and getting into it as much as you would at a show.
Put Dillinger on, its time to Rock out with your Cock out!
by DreamsL0ST June 18, 2005
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At my boys house we rocked out with our cocks out as the ladies came into his room
David: Yo the chicks are coming...rock out with your cock out!

Frankie and Brandon: WHAT!?!? OK! (rocking out with their cocks out for the ladies)

derived from the hebrews.
by Salter April 17, 2006
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A synonym to "whatever floats your boat" used by the common faggots known as "road men"
Oi Jim what shall I do with Fatima tonight blad. "Whatever rocks your cock" fam
by IAmBeeJ March 10, 2016
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