
tanken
to refuel / fill up
To put fuel such as gasoline or diesel into a vehicle's tank.
Ich muss noch tanken, bevor wir auf die Autobahn fahren.
I still need to fill up before we get on the highway.
to refuel / fill up
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to refuel / fill up
To put fuel such as gasoline or diesel into a vehicle's tank.
Ich muss noch tanken, bevor wir auf die Autobahn fahren.
I still need to fill up before we get on the highway.

to soak up
In a figurative sense, to take in new energy, strength, or also sunshine in order to recover and feel stronger.
Im Urlaub am Meer will ich vor allem Sonne tanken.
On vacation by the sea, what I mainly want to do is soak up the sun.

to booze
Colloquial for drinking alcohol, often in larger quantities.
Die Jungs gehen am Wochenende wieder ordentlich tanken.
The guys are going out boozing properly again this weekend.
The verb 'tanken' (to refuel/fill up) derives directly from the noun 'der Tank' (the tank). This connection to the basic meaning 'to fill a container' helps you remember the word.
Der Tank ist fast leer, wir müssen gleich tanken.
The tank is almost empty; we need to fill up soon.
In its main meaning, 'tanken' (to refuel/fill up) can be used without an object when it is clear that it refers to the vehicle. But you can also add an object to specify what you are filling up with.
Warte kurz, ich muss noch schnell tanken.
Wait a moment, I still need to fill up quickly.
In the figurative meaning, 'tanken' (to soak up/recharge) is often combined with positive, abstract things. Common phrases are 'Sonne tanken' (to soak up the sun), 'Kraft tanken' (to regain strength), 'Energie tanken' (to recharge one's energy), or 'Selbstvertrauen tanken' (to gain self-confidence).
Nach der anstrengenden Woche muss ich am Wochenende neue Kraft tanken.
After the exhausting week, I need to regain some strength over the weekend.
The meaning 'to drink alcohol' is very colloquial and should only be used in very informal situations among friends. It often implies that larger amounts are being drunk.
Was habt ihr am Samstag gemacht? – Wir waren erst was essen und haben dann noch ordentlich getankt.
What did you do on Saturday? – We went out to eat first and then had a proper drinking session.
to drink
„Trinken“ is the neutral term for consuming alcohol, regardless of how much someone drinks. „Tanken“ is used colloquially in this sense and often suggests larger quantities. Use „trinken“ in factual language and „tanken“ when the casual, intensified expression is intended.

Die Freunde wollten nach der Arbeit noch ordentlich Alkohol tanken.
The friends wanted to really load up on alcohol after work.
Die Freunde tranken nach der Arbeit noch ein Bier zusammen.
The friends had another beer together after work.