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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
11 7
 
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
38 16
 
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
36 15
 
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
30 10
 
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
10 0
 
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
3 6
 
7.
a pokemon ability that prevents recoil damage.
It turns out that Sudowoodo's ability is rock head.
by Light Joker April 04, 2004
14 20