beeswax (n.)

also bees-wax, "wax secreted by bees and used in making the cells of their hives," 1670s, from genitive of bee + wax (n.). As a jocular alteration of business (usually in an injunction to someone to mind his own) attested from 1934 in Lower East Side slang as reproduced in Henry Roth's "Call It Sleep."