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Someone who has a six pack because that person lost so much weight during their sickness. This normally happens when the illness was nauseating.
Dude since when does Nick have a six pack or abs at all.

He doesn't normally it's a major sick pack
by @bztЯ@kt November 22, 2011
Someone who has great abs. They have 6 or 8 packs. And They look so good.
Jessica Alba has a sick pack.
by Gozzy November 06, 2006