Maniac:
Nickname for a player who is very aggressive. This type of player plays a lot of hand, raises frequently, and often bluffs. Often, maniacs lose a lot of money at poker
Middle Position:
These are players that tend to act during the middle of a betting round. For example, in a field of 10 players, the players in the 4-7 position are players in middle position
Motown:
jack and fives
Muck:
When a player discards their cards face down so as not to reveal their value