The spelling of the word "gat fix on" can be explained using the International Phonetic Alphabet (IPA). The word "gat" is spelled with the sound /gæt/, with the letter "g" representing the hard "g" sound and the letters "a" and "t" representing the sounds /æ/ and /t/ respectively. The word "fix" is spelled with the sound /fɪks/, with the letters "f" and "x" representing the sounds /f/ and /ks/ respectively. Finally, the word "on" is spelled with the sound /ɒn/, with the letter "o" representing the sound /ɒ/ and the letter "n" representing the sound /n/.