1 definition by Gory Spirit
When a guy inhales as deeply as he can and flexes his muscles to seem bigger. It's usually done to seem more impressive in a photograph, but sometimes as an attempt to scare away a rival male.
Guy 1: "I was going to kick that nerdy guy's ass, but he took off his shirt and was buff."
Guy 2: "He was doing the Pufferfish."
Guy 2: "He was doing the Pufferfish."
by Gory Spirit March 11, 2011