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!!!!
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Verb. 1) Taking a shit in your woman's vagina.
"Yo Steve, yesterday I gave Yolanda the chocolate chunky train. It took that bitch two days to clean out her cooch!"
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