Thon
Origin
Proposed in 1858 by Charles Crozat Converse from that + one.
Quidnunc, “Thon—That's the Forewhoâ€, American Speech, Volume 48, Number 3/4 (Autumn–Winter 1973), pages 300-302
Full definition of thon
Pronoun
Usage notes
A neologism when Charles Crozat Converse coined it in 1858, thon has seen limited use since then.