A court in Dubai slapped a fine on a man for swearing at a colleague using the smartphone instant messaging app.
The man has been slapped a fine under a new law which came to light when the UAE's supreme court ordered the retrial of a man fined Dirham 3,000 ($800) for the offence, BBC reported on Wednesday.
People living in the country if found guilty could also face jail and foreigners may face deportation.
The court did not reveal the content used by the man on Whatsapp, it simply termed it insulting.
The case was filed against the man under a cyber crime law introduced in the UAE in October last year that made online verbal insult a criminal offence.
According to media reports, authorities in the UAE last month warned that sending a middle finger emoji symbol would also be punishable under the law.