This appears to be a non-standard or playful word; it may be a variant or confusion with 'flapjack' (a pancake or oat-based baked good).
Likely a blend or mishearing of 'flapjack,' where 'flap' (the sound of pancakes cooking) and 'jack' (a common ending for foods) combine. 'Flip' may have replaced 'flap' in this variant.
The confusion between 'flapjack' and 'flipjack' shows how closely English speakers associate the cooking motion with the food—if it can flip, it gets called a flip-jack even if the original name was flap-jack.
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