A heroin addict, normally someone who shoots or smokes meth. Using the term smack, in the slang because normally heroin causes people to nod out, making someone come up and smack em on the head.
C'mon Charlie! Get up. *Smacks the back of Charlie's head* Quit bein a stupid smackhead! We got shit to do
by Suuuuuheilyyyy October 3, 2017
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while walking fast with your head bousing up and down as you go
like somebody when thay have been on smack or cocaine
ben: look at him there hes proper smackheading it
by ben ingo November 12, 2007
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- Awwwrite bud. Whas da stooory?

- Fuckin' jackeen smackhead in my face, that's the story.
by Siucra Ray October 11, 2006
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this is a colour to describe the grey garments worn by the generic lower class delinquent chav and NPC across the entirety of the UK.

the worst items of clothing to be this colour are: joggers, leggings, and hoodies.

if you encounter someone wearing smackhead grey joggers / leggings, let it be known that this person is devoid of all personality and probably watches love island regularly.
there are so many people at my college wearing smackhead grey - when will they develop a fashion sense? will they stay wearing 11°, nicce and gymshark?
by lil chigg February 21, 2020
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Every December starting December 1st ending December 31st, is where you smack a bald persons head. it can be your grandma, your grandpa, your mom, dad anyone :)
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Flats with a high concentration of smackheads, usually in Urban or Sub Urban areas. People who live in smackhead flats usually use their welfare money to purchase Heroin and maybe also Cocaine making them potential crackheads too.
Jim Lost his job, he could not pay his rent therefor he was evicted - he now lives in the smackhead flats in the local shithole.
by NahItsSad January 1, 2018
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