first of May n.2
(US tramp) a novice; see cit. 1931; also in ext. use as anyone who does not stay the course.
|Amer. Tramp and Und. Sl. 73: FIRST OF MAY.–Properly, any one newly employed by a circus, where the season starts about the first of May. By adoption, any tramp but newly arrived in a ‘push’ or new to tramp life and as yet inexperienced.|
|Hey, Sucker 15: If you do stop, you’re a ‘heel’ – or, worse, a ‘First of May!’.|
|Man Who Was Not With It (1965) 100: Hey, you first-of-Mayers, Bud Williams is back!|
|(con. 1940s) Tattoo (1977) 573: Know what they call you behind your back? [...] ‘First of May.’ That’s an old carnival term for someone who comes out in the spring but doesn’t last through the winter.|