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1 definition by Twallas McGee

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