The phrase "gat bandwagon" doesn't have a standard meaning in English, so it is difficult to provide antonyms for this specific term. However, antonyms for the word 'bandwagon' include terms such as unpopular, out of fashion, old-fashioned, behind the times, and unappealing. Similarly, antonyms for 'gat' (which can be interpreted as slang for a gun) could include words such as peace, safety, and security. The use of antonyms can be a helpful tool in broadening one's language skills and understanding the nuances of different words, and making words more memorable for the reader.