What word or phrase does your mother always say?
1838, "counterfeit money, spurious coin," American English, apparently from a slang word applied (according to some sources first in Ohio in 1827) to a counterfeiter's apparatus.
One bogus or machine impressing dies on the coin, with a number of dies, engraving tools, bank bill paper, spurious coin, &c. &c. making in all a large wagon load, was taken into possession by the attorney general of Lower Canada. [Niles' Register, Sept. 7, 1833, quoting from Concord, New Hampshire, "Statesman," Aug. 24]Some trace this to tantrabobus, also tantrabogus, a late 18c. colloquial Vermont word for any odd-looking object, in later 19c. use "the devil," which might be connected to tantarabobs, recorded as a Devonshire name for the devil. Others trace it to the same source as bogey (n.1).
[origin unknown; certainly connected with bogus,attested as name of a counterfeiting machine in 1827, whence a connection has been made with bogy]