What’s a good excuse to leave the house and see my boyfriend?

Im 23, want to leave the house today to go see my boyfriend. My mother is off work today and when I usually leave the house she always ask where I’m going. I don’t want to tell her to meet up with a guy bc she will ask who where and why and be like no it’s too dangerous. So I want to make up something.
What’s a good excuse to leave the house and see my boyfriend?
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