A more thorough explanation:

Definition: A tapper is someone who asks another person for money, usually as a form of begging. It can also refer to someone who steals from others.

• The homeless man on the street corner was a tapper, asking passersby for spare change.
• The pickpocket was a skilled tapper, able to steal wallets without anyone noticing.

These examples show how a tapper can be someone who begs for money or someone who steals from others. In both cases, the tapper is trying to get something from someone else without earning it themselves. This behavior is generally frowned upon and can be illegal in some cases.