>... Though we have citations for "omnibus" (see OED2 and DSUE), I believe >that we still lack a citation for "omnibus boy." There may not have been any "omnibus boy" in this sense. Perhaps the development was "omnibus" (= "waiter's helper", 1888 in OED) > "bus" (noun meaning "busboy": appears in MW2 and MW3) > "bus boy". -- Doug Wilson