funny business
noun Informal.
improper or unethical conduct, as deception or trickery: He won't stand for any funny business here.
Origin of funny business
An Americanism dating back to 1880–85
Words nearby funny business
funnelform,
funnies,
funny,
funny bone,
funny book,
funny business,
funny farm,
funny money,
funny paper,
funnyman,
funster
Idioms and Phrases with funny business
funny business
Deceit, treachery, unethical conduct. For example, We suspect their outfit has been up to some funny business. [Colloquial; c. 1880]