This is a non-standard spelling; the correct past tense of 'flip' is 'flipped' (with double 'p').
This appears to be a misspelling of 'flipped,' the past tense of the verb 'flip,' which comes from Middle Dutch 'flippen.'
English's doubling rule is tricky: one-syllable words ending in consonant-vowel-consonant double the final consonant before adding '-ed' (flip→flipped), but many spelling errors show how this isn't intuitive to learners.
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