1. An ironic or sarcastic wish directed at someone, typically expressing the opposite sentiment—implying the person will have a bad, difficult, or terrible day
After the argument, she said sarcastically, 'Have a wonderful day!'
Depois da discussão, ela disse com ironia: 'Que tenha um dia maravilhoso!'
2. A dismissive or passive-aggressive farewell used when parting with someone on bad terms
He walked away muttering, 'Have a wonderful day,' clearly meaning the opposite.
Ele se afastou murmurando 'Que tenha um dia maravilhoso', claramente querendo dizer o oposto.