Celoso means "jealous" in Spanish. It's a central theme of the song, as the title itself, "No Seas Celoso," translates to "Don't Be Jealous."
Kim Loaiza repeatedly addresses her partner's jealousy throughout the lyrics, making this word not only memorable but also key to understanding the song's message about trust and freedom in a relationship.
"No Seas Celoso" is Kim Loaiza telling her partner to relax about jealousy. She jokes that if his jealous streak were gold, he'd be rich, since he gets worked up over nothing.
Her message is simple: she is committed to him and to no one else, so rumors about other guys don't matter. Even when he complains and gets moody, she reassures him with the same line again and again: don't be jealous, don't act awkward around her friends, and drop the sour face.
Being a little flirty is just her personality, she says, not a threat to the relationship. The song is a light, upbeat push for a partner to trust her instead of getting possessive over normal social moments.