tank up

Verb

Meaning

(transitive, intransitive, Canada, US) To fill up (for example, a tank in a vehicle with gas, petrol, etc.).

(transitive, intransitive, slang) To intoxicate oneself, especially with alcohol.

(intransitive) To install a tank.

Source: en.wiktionary.org

tope gas booze tipple hit the bottle

Chief of security : They have a tank! How did they get a tank up here? Eoin Colfer