Machias?
More digression; reminiscent of:
Old Casey Jones was a son of a bitch
Ran his engine in a hell of a ditch
Motor exploded, whistle split
The fireman fainted and Casey shit.

Also:
Old Casey said before he died,
There's four more things I'd like to ride:
Bicycle, tricycle, pushmobile,
And a bow-legged whore on a Ferris wheel.

Burke pretty well covered the meanings of rounder. One other has been added in the OED; a worker who shapes or rounds something in a factory.

Probably posted before, these childhood rhymes are from Randolph and Legman, "Roll Me in Your Arms."