Used to describe someone with a huge head shaped like a basketball. Often used to insult someone with a big head and a skinny body that is disproportionate.
Noun . Being slow witted and a dullard despite having an enormous cranium. Similar to the Pumpkin Head Larry in which said dullard also has red / ginger hair
"Man Burcham cannot figure out how to use that computer and its totally idiot proof. He's totally a Big Head Larry"