The spelling of the word "OP LOTSL MACH" can be explained through the use of the International Phonetic Alphabet (IPA). The first two letters, "OP," represent the vowel sound /ɑ/ and the consonant sound /p/. The following three letters, "LOT," represent the vowel sound /ɒ/ and the consonant sounds /l/ and /t/. The final three letters, "SL MACH," represent the vowel sound /æ/, the consonant sounds /s/ and /l/, and the vowel sound /ɑ/. This word appears to be a made-up word with no clear meaning or context.