Green’s Dictionary of Slang

(mainly juv.) a ‘fellow’, a ‘chap’.

1937		T. Thursday ‘Good Luck is No Good’ in Federal Agent Nov. 🌐 Right away I knew this beezo is right for a deal.
1982		G.V. Higgins Patriot Game (1985) 62: There is that beezer Harrington that works the electric plant.