Top Definition
Any child that is the offspring of the no-talent borderline-retarded Hollywood A-lister Matthew McConaughey.
Guy 1: Hey, did you see the picture of McConaughey's Brazilian supermodel girlfriend?

Guy 2: Yeah, I heard she just squeezed out a McConaughbaby.
by gregstir November 06, 2008
5 Words related to Mcconaughbaby

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