Maniac
Basic Definition
A "maniac" in poker refers to a player with a very loose (wide hand selection criteria) and aggressive (frequently betting and raising) playing style. This often leads to intense battles due to the frequent exchange of chips.
Specific Situation
A player who frequently raises pre-flop despite having weak hands like 
.
A player who goes all-in on the flop despite not having a particularly strong hand.
Important Information
Due to the unpredictable nature of a maniac's playstyle, it's important to respond calmly and engage aggressively when you have a strong hand.
Getting involved in overly niche plays increases the risk of losing your stack. Aim for solid gameplay.
Examples of Term Usage
"When there's a maniac at the table, the pot tends to grow larger, so you should play conservatively and wait for your chance."