Tiger in (one's) tank noun phrase informal
A lot of energy, spirit, and motivation
All these shouts of excitement will help put a tiger in their tank.
1. Used to describe someone that are alert, energetic, and enthusiastic, typically after some refreshing activity.
2. Extremely clean and neat, or well-kept.
An abundance of exuberant, young vigor, enthusiasm, or vitality.
Something you have wished for a long time that has now happened
'Put a tiger in your tank,' was a 1960s advertising tagline for Esso gasoline.