How are nicknames determined?

Solution 1:

Player Names in Poker Night were awarded based on a combination of your wins versus losses, measured against how long you had been playing. Here are some which I've encountered. They still manage to crack me up.

Paws Hogg, Poker Pro Ace Ginger, Stunt Pilot Rake Frechman, Money Aficionado Max Ides: The Middling Killer

Ziggy Flophouser Remy Rebuy, The Optimist Dame Olive Cardpalm Artie Flopshark, Deceased

Chet Chester, Cheddar Checker Chin "The Chilla Chin" Chiller Suzy Sideking Hamilton "Short" Stacks

Poorpockets McNewhols “Leaky" Milkstraw Bobo Woodcoin Mickey Mensch The Pocket Padder

Source: Telltale Community