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1.
Some one who will do anything for crack, including sucking dick and steling cheesburgers then tring to sell them.
Look at that rock head sucking dick for a dollar.
by woogie May 27, 2003
 
2.
An male idiot; one possesing no knowledge of how to treat a woman or what a woman wants. A waste of space.
Ashley: I'm sick of dating nothing but rock heads!
Natty: We need to find us some real men.
by natty & ashley April 02, 2007
 
3.
A crack head or someone who smokes crack.
Crack looks a lot like a small rock.
Yea man the rock head o.d over there but lived
by n333m September 07, 2005
 
4.
A person from the greater Rockledge/Fox Chase area of Philadelphia, Pennsylvania. Appears to be very friendly; however, only seeks friends for his/her popularity. Will often seek a career in boxing or politics. Die hard Republican. Has many tattoos and smokes cigarettes. Wears Polo collared-shirts and Nike Air Force Ones. Has a buzz-cut with a fade on each side. Will never leave the Rockledge/Fox Chase area.
"When I get pulled over by the cops, they see that I am from Rockledge and immediately let me go."

"I just got a new leg tattoo of a dragon. It looks pretty sick."

"Anyone have a pack of Marlboro's that I can smoke?"

"Every neighborhood in Philadelphia will be black in 10 years, unless us Rockheads have anything to say about it!"
by Howard Ethel July 02, 2012
 
5.
Someone who is dumb and/or does stupid things.

You might also say they have rocks for brains or they are as dumb as a rock.
Someone says something ignorant or totally speaks without thinking.

You might respond by calling them rockhead or rockbox.
by RockBox June 21, 2007
 
6.
The condition of having a weed hangover. When you have rockhead you generally have overdone the smoking slightly, having a very dry mouth and a niggling headache behind the eyes that you just can't shake. You're not at your best.
"Wow dude, I have serious rockhead this morning, think i had a bit too much ganja last night!"

"Alright mate? You suffering from a bit of rockhead there?"
by Twallas McGee October 02, 2009
 
7.
a pokemon ability that prevents recoil damage.
It turns out that Sudowoodo's ability is rock head.
by Light Joker April 04, 2004