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a person who is acting stupid, trying to be funny, or a wanna-be
Bob, was being such a sackhead, that everyone left the party
sackhead by ashanakwa December 30, 2009
Someone with no hair on their Head. (A bald person)

They are called a 'sack' head because their head looks like a hairless scrotum.
Timmy's got no hair left, he's become a sackhead.
Sackhead by MilkDudlington August 23, 2016
Hair tied into a bun that resembles a ball sack. A potential sackhead begins as a perky, well proportioned bun. Through continued exposure to life, that once perky bun becomes a sagging shell of what it used to be.

If a friend is sporting a sackhead, it is your duty to promptly alert them of the saggage upon their head so they can fix it immediately.
"I can't believe Kristin actually went to the store with a sackhead, she really needs to fix that hair!"

"After working out, Katie's once perfect bun has become a sackhead."
Sackhead by Ethel_8000 February 28, 2018

smackhead grey 

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?
smackhead grey by lil chigg February 20, 2020

smackhead 

A smackhead is a person who is severly dependent on heroin (smack)
You dirty smackhead

sickhead 

comes from the south west of London around the Wimbledon area... meaning a person is crazy or sick in the head to do such and obscene thing
-"allow jumping over that barbed wire fence, you sickhead" ... cops are comming
sickhead by Jon July 7, 2004