verb: to suck in one's gut in order to appear slimmer and to do so to the extreme that the act becomes obvious. David Hasselhoff was notorious for this behavior while he starred-- often shirtless--on the show Baywatch. Other actors or models who are required to go shirtless have also exhibited the same behavior. However, in contemporary media the practice is very rare and easily spotted.
Is that guy Hasselhoffing, or was he born without any internal organs?