We found one dictionary that defines the word when the fat hit the fire:

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1. when the fat hit the fire: Idioms

▸ Words similar to when the fat hit the fire ▸ Usage examples for when the fat hit the fire ▸ Idioms related to when the fat hit the fire ▸ Wikipedia articles (New!) ▸ Words that often appear near when the fat hit the fire ▸ Rhymes of when the fat hit the fire ▸ Invented words related to when the fat hit the fire