Top Definition
a disorder where the sternum is seemed to be pushed back into the body giving an hole appearance in between the breasts. the rib cage can also be deformed and it could lead to heart and lung problems. also be called as a "hollowed chest"
Jimmy: wtf is wrong with Penelope's chest?
Victor: she might have pectus excavatum.
Jimmy: wtf is that.
Penelope: stfu fags
by tayroll December 02, 2013

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