seven-head 

It comes from chinese.
It is a nounalways Single
FormalSeven-head is another term of idiot.It is more polite than just saying that you are idiotic.
P.S. It is different from Hot-head

RightThey are seven-head
WrongThey are seven-heads
They have seven-heads

seven-head by Tony Chan September 10, 2004

seven heads 

seven heads means an idiot with a stupid hairstyle

Chan Tong is a seven heads

seven heads by Brian@lsc November 28, 2018

heads up seven up 

A game used in elementary school where you always looked down on the floor for people's shoes to tell who picked your thumb.

heads up seven up at school

heads up seven up by Mycin November 21, 2014

Sevenhead 

A play on the word "forehead," usually used in reference to a woman with an exceedingly large space between her eyebrows and forehead.

Christiana Ricci is a freaking sevenhead!

Sevenhead by Phife54 June 18, 2009

Sevenhead 

When one is almost bald but still has hair on the sides and back of his head, he is said to have a sevenhead.

My grandpa is so old, he has a sevenhead!

Sevenhead by Open_Breifcase February 21, 2009