Teahead is British slang for a habitual user of cannabis.
Pass the puffer, you tea-head.
ayon kay j. zerusi ika-15 ng Enero, 2005
1 more definition
Beat slang for someone who smokes a lot of marijuana.
The Mexican jooks were full of teaheads in those days.
ayon kay 23skidoo ika-22 ng Enero, 2009