The maverick poker term can refer to a couple of things. A maverick can be a highly skilled poker player who performs well in high-pressure situations.
An example of this in a sentence could be: “the table I played at the tournament was made up of mavericks, so I had no chance, but it was still fun.”
The second thing the term maverick refers to is a Q, J poker hand in the hole, suited or otherwise.
An example of the second definition in a sentence could be: “I had a maverick hand and hit a pair of queens on the flop to make a three of a kind.”