noun / verb / interjection
humbug
HUM-bug/ˈhʌmbʌɡ/
A display of deceptive or insincere pretension.
The shell-game operator's show of fairness is humbug: she secretly holds the ball.

Etymology
Humbug's origin is unknown, but its early student-slang meanings included a trick, jest, or hoax. Its later sense of sham or hollowness connects those uses with deceptive or foolish talk.
In context
it's all humbug you know
More examples
- That self-proclaimed expert is a humbug who invents his credentials.
- The salesman humbugged us with promises he never intended to keep.
- “Humbug!” she says when he claims to have predicted the outcome.
Forms
humbug · humbugs · humbugged · humbugging