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1) A frequent user of the drug DXM (dex), which comes in cough syrup. If ingested in high amounts, DXM can produce hallucinogens and euphoric feelings.

2) Used in reference to a person who is generally spaced out, or oblivious to his or her surroundings.
1) My friend is such a dexhead! He just bought two more bottles of nyquil, and he's tripping on the shit right now!

2) That kid on my bus was just staring out the window when Ashley was trying to talk to him. What a dexhead.
dexhead by joe February 12, 2004
Related Words

Dehradun 

The most beautiful place known to mankind.

Located at the foothills of the Himalayas, this city is the capital of Uttrakhand.
Dead Angelic Human in Heaven: I'm in heaven.. The trees, the weather, the mountains..its heaven for sure.

Human On Earth: I know what you mean.. I got the very same feeling when I visited DEHRADUN!
Dehradun by Tanya Singh January 10, 2011
A person stuck in the 80's...may have a mullet, tight jeans, sometimes pegged, comb in back pocket, listens to Def Leppard, and drinks Mountain Dew (in a glass bottle if available). Most often seen driving an old Camaro or Firebird. Watches Nascar and drinks cheap beer. The female form still has "mall hair" after all these years, curses like sailor, and still owns a Warrant CD.
"Look at all the dewheads in line for Poison tickets!"
Dewhead by Phil Hitt July 24, 2003

COK IN DE HEAD SYNDROME 

This occurs when your father, or another man, or woman with a dildo, or your mum with a dildo, entered your mothers vagina while she was pregnant with you which led to the impression of the penis/dildo being left in your soft skull. This then becomes a feature of your skull. It can be useful for storing food or as a flower vase.
'Look at that big whole in his head mummy'
'Don't stare, hes got cok in de head syndrome'
A fan of DEFTONES...A mostly honorable nickname actually!
Evan: What is the best band; Incubus or Deftones huhh?

Jones: How dare you mention the mighty Def´ in the same sentence as that lamecore popfunk band of wankster?

Evan: You are such a Defhead...

Jones: Hellll Yeahhhhhhhhhh! I´m buying the next round!

Evan: ....*sigh*....
Defhead by Tankred February 23, 2011

Ghosts in de head 

When someone is acting crazy or insane, mental

Coined by tommyinnit circa June 2020
Your friend got a maths problem wrong.

"Oi mate, you've got ghosts in de head!"
Ghosts in de head by zubmouse February 3, 2021