noggin

 
Pronunciation: /ˈnɒgɪn/

noun

informal
  • 1a person’s head: it hit him squarely on the noggin
  • 2a small quantity of alcoholic drink, typically a quarter of a pint: I imagine you all go round to the pub afterwards for a quick noggin and a chat

Origin:

mid 17th century (in the sense 'small drinking cup'): of unknown origin