(thing) by Vulgar Tongue 1811 Mon May 09 2005 at 1:55:33
thingumbob

Mr. Thingumbob ; a vulgar address or nomination to any person whose name is unknown, the same as Mr. What-d'ye-cal'em.

Thingumbobs ; testicles.

The 1811 Dictionary of the Vulgar Tongue.

I like it!