Ratholling is a poker term that refers to the action of taking money out of a cash game after a win in order to prevent losing it. When a player ratholes, they deny their opponents of the opportunity to win back their losses. As such, it is considered bad poker etiquette and is generally frowned upon, although not forbidden.
Rathole Poker Example:
Let’s say you’re playing a $1/$2 cash game, and you buy in for $200. A couple of hands later, you call a big raise, win the hand, and end up with $400 worth of chips. Immediately after, you decide to take $200 off the table by leaving and buying in again with $200. This is called ratholling.