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A six pack that one has because they have absolutely no body fat that would conceal a lack of muscle.
Girl: Wow, that guy's got some great abs! Look at that six pack. Do you work out?
Guy: Nope, these are default abs, baby.
by Tentacle head November 26, 2010
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2
When a dude has abs because he's so skinny.
Omg Katie, did you see Tristan's abs?
Girl he's like 100 lbs...those are default abs.
via giphy
by savagebeach11 December 11, 2016
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