Can someone explain this rule

[Northern Hillbilly]

At the poker room I have been playing at recently I read the rules outside poker room for the first time .
One of the rules is NO OVERPLAYING. What is Overplaying ?

Edit I was thinking maybe show boating but not really sure

[Northern Hillbilly]

NVM I found out.

In vegas if I stand up and leave the table with my chips at it. Another player can ntake my seat and play till I return. The house would then cover my chips . While the player played over, till I returned.

At least that is how the floor supervisor explained it to me. The dealer I asked had no clue