Porta-potty

Origin

From the commercial name; probably a portmanteau of portable and potty.

Full definition of porta-potty

Noun

porta-potty

(plural porta-potties)

A portable toilet; a self-contained outhouse.
(UK) A portable chemical toilet comprised of only the fixture rather than the entire enclosure.

Synonyms

(portable toilet) portable, portable toilet, port-a-john, porta-kybo, portaloo, port-a-san, port-o-let, sani-privy, turdis