A thick head noun phrase informal
Someone dumb and slow-witted.
You know you can't trust Tim. That guy has a thick head.
To have an aching head and hazy thoughts as a result of being unwell or drinking too much alcohol.
I can't concentrate on anything because I'm having a thick head now. I shouldn't have drunk too much last night.
A thick, creamy foam formed when beer is poured into a glass.
Henry really enjoys drinking beers with thick heads.
Extremely stupid
Very stupid, or silly
Stupid or crazy
(n): a fool person,
(adj): stupid, foolish, silly
A stupid person or an idiot
This phrase appeared for the first time in the 1700s.