monkey business
US /ˈmʌŋ.ki ˈbɪz.nɪs/
UK /ˈmʌŋ.ki ˈbɪz.nɪs/

1.
palhaçada, trapaça, brincadeira
silly, dishonest, or mischievous behavior
:
•
Stop all that monkey business and get to work!
Pare com toda essa palhaçada e vá trabalhar!
•
The teacher suspected some monkey business was going on during the exam.
O professor suspeitou que havia alguma trapaça acontecendo durante o exame.