funny business

noun Informal.
improper or unethical conduct, as deception or trickery: He won't stand for any funny business here.

Origin:
1880–85, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  funny business1
Part of Speech:  n
Definition:  deceptive, underhanded behavior
Main Entry:  funny business2
Part of Speech:  n
Definition:  foolish behavior; shenanigans
Main Entry:  funny business3
Part of Speech:  n
Definition:  amorous behavior; sexual intercourse
Dictionary.com's 21st Century Lexicon
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American Heritage
Idioms & Phrases

funny business

Deceit, treachery, unethical conduct. For example, We suspect their outfit has been up to some funny business. [Colloquial; c. 1880]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
He put lawyers, jurors and the media on notice from the start that there would
  be no funny business.
While we've heard bone bruise and other rumors, the lack of a clear diagnosis
  means funny business.
Any divergence that shows up sets off alarm bells in those looking for funny
  business.
Still, there seems to have been some funny business.
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