1. A curse or negative wish directed at someone, expressing hope that they experience misfortune or difficulties
After the argument, she told him: may you have a bad day!
Depois da discussão, ela lhe disse: que tenhas um dia ruim!
2. A sarcastic or angry farewell expressing displeasure or anger toward someone
He left the meeting saying: I hope you have a terrible day!
Ele saiu da reunião dizendo: que tenhas um dia ruim!