skinny pack

“The skinny pack,” is a phrase the website Purelifts.com invented for those guys who go out all the time with their shirts off thinking they have a 6 pack. I’m talking about the guys who are about 6’2 and weigh 120lbs if they are LUCKY.

Guy: Damn, why do girls fancy that guy in Twilight so much? He's just a rat with a skinny pack.