monkey business

[monkey business] {n.}, {slang}, {informal} 1. Any unethical,illegitimate, or objectionable activity that is furtive or deceitful,e.g., undercover sexual advances, cheating, misuse of public funds,etc.

There is a lot of monkey business going on in that firm; you'dbetter watch out who you deal with!

2. Comical or silly actions;goofing off.

Come on boys, let's cut out the monkey business andget down to work!