blockhead
noun
1
a stupid fool, an idiot. Originally 'a wooden base for hats or wigs', hence 'wooden-headed' UK, 1549.
2
a drunken yob. This usage was coined by Ian Dury in the song 'Blockheads', which offered the lyrical definition: '"pissed up" gangs of lads' UK, 1977.
3
a marijuana user. A combination of BLOCK (marijuana) and HEAD (a user) UK, 2001.
4
a railway brakeman US, 1977