The speaker decides to leave a relationship after realizing that her partnerโs affection has changed and that he has been unfaithful and dishonest. At first, she sounds hurt and angry, but the repeated decision to go becomes more confident. She wants a partner who values her love, and she frames leaving as something she must do for her own well-being.
โShake you offโ is an informal metaphor: she wants to get free of the partner and the emotional burden of the relationship, not literally shake him. The reference to a Calgon commercial evokes the idea of escaping from stress and going somewhere else. Packing her belongings and leaving in a car make her decision concrete; she is not just threatening to go but taking action.
The song presents leaving as empowering, yet the speakerโs feelings are not entirely simple. Her remarks that he will miss her and that no one will love him more suggest lingering attachment, pride, or a wish for him to regret his behavior. The energetic, repetitive refrain makes the choice sound decisive, but it does not prove that moving on is emotionally easy. The lyrics can be read as both a declaration of independence and a way of convincing herself to follow through.