Top Definition
Totally buried (by flab) abdominal muscles in the configuration of a back pack. The exact opposite of a “six pack,” the definition of which is: “Well defined abdominal muscles in the configuration of a six pack of canned drinks.”
A uni pack could be described as: “Undefined abdominal muscles in the configuration of a two-liter bottle of Coca Cola carried in a school back pack that is already full of homework.”

Used by Jillian Michaels on 'Rachael Ray' 11/15/2011.
"Oh man, Bert's sure missing a six pack."
"Yeah, but he's not missing his uni pack." (snickers)
by =DSA. November 15, 2011

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