We found one dictionary that defines the word tiger in one's tank:

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1. tiger in one's tank: Wiktionary

Definitions from Wiktionary (tiger in one's tank) ▸ noun:  (informal) enthusiasm, energy, fervor ▸ Words similar to tiger in one's tank ▸ Usage examples for tiger in one's tank ▸ Idioms related to tiger in one's tank ▸ Wikipedia articles (New!) ▸ Words that often appear near tiger in one's tank ▸ Rhymes of tiger in one's tank ▸ Invented words related to tiger in one's tank