v.1. To fill the tank of a motor vehicle with gasoline: Gas prices are so high, I can barely afford to tank up. Don't tank up with low-quality gasoline.
2. To eat, drink, or accumulate a supply of food or drink: Midway through the hike, we stopped by a stream to tank up on water. The travelers pulled into a roadside diner and tanked up.
3. Slang To intoxicate someone: Someone poured a bottle of vodka in the punch and tanked up the unsuspecting partygoers. The kids got tanked up on soda pop and ran around in the yard. Many of the revelers were too tanked up to drive home.
4. Slang To drink to the point of intoxication: The losing team is tanking up at the bar.
5. Slang To be consumed to the point of intoxicating someone: That last glass of whiskey really tanked me up.