Definition of top ups:
(v) :
(idiomatic) To add to a balance in an account (e.g., mobile payment, debit card, bank account).
(v) :
(ambitransitive) To refill (or recharge) something.
(v) :
To add to a number or amount, to bring something up to a certain level.
(v) :
(UK) To refill a drink.
(v) :
(ambitransitive, slang) To have sex (with).