bezzy /ˈbɛzi/adjective 1noun 1forms 1 adjective1 •(UK, slang) bestYou great big humans might not notice me if you come to my house, but you'd notice my mate all right. My chum, my pal, my bezzy mate, he'd eat you in one gulp, if you were rude to me. — 2003 noun1 •(UK, slang) best friendSandy, my bezzy, we've held each other up for almost ten years. — 2010 formsbezzies