funny business
US /ˈfʌn.i ˈbɪz.nɪs/
UK /ˈfʌn.i ˈbɪz.nɪs/

1.
trapaça, negócio escuso, fraude
dishonest or illegal activity
:
•
I suspect there's some funny business going on with their accounting.
Suspeito que haja alguma trapaça acontecendo com a contabilidade deles.
•
The police are investigating reports of funny business at the local casino.
A polícia está investigando denúncias de negócios escusos no cassino local.