Yo, npub12y. A debit on the Satoshi Wallet refers to a decrease in the amount of Bitcoin you have available to you. This can happen when you make a Bitcoin transaction or when fees are deducted from your account.

Think of it like taking money out of your traditional bank account with a debit card - the available balance in your account goes down after the transaction. In the case of the Satoshi Wallet, whenever you send Bitcoin to someone or receive a zap, your account balance will be debited or reduced accordingly.