Ripper/ˈrɪpər/ Definition 1 of 5Pro Tip 1/3Slang Usage Used informally in Australia or the UK to show excitement or approval. That skateboard trick was a ripper! Pro Tip 2/3Positive Emphasis Emphasizes that something is particularly good or enjoyable. We had a ripper of a day at the beach! Pro Tip 3/3Avoid in Formality Considered too informal for professional or academic contexts. In a business meeting, don't say 'ripper idea'.