When a formally thin or skinny person gains a large to obscene amount of weight from the last time you saw them.
I hadnt seen Jessica Simpson since Dukes of Hazzard, GIRRRL she got hit by the CHUNKY TRAIN!!!!
by Sammiohfries January 27, 2013
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"Yo Steve, yesterday I gave Yolanda the chocolate chunky train. It took that bitch two days to clean out her cooch!"
by froznalyve September 16, 2007
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