In Spanish slang, 'perno' is used to refer to a person who is considered boring, dull, or not fun to be around. It is often used to describe someone who prefers to stay in rather than go out.
Examples
- Spanish: No invites a Juan a la fiesta, es un perno y nunca quiere bailar.
- English: Don't invite Juan to the party, he's a bore and never wants to dance.