means "Fat Dumb Kid". A child who has the qualities of being fat, pudgey, gellatinous, dough-like, and/or dumb, half retarded, cobweb-headed, or droolmonkeyish. A "FDK" usually sits at home on myspace and/or attempts to skateboard with his more thin,able-bodied friends. If you attempt to sit bare-assed upon a "FDK" (see chewbacca ass), you will most likely recieve a finger in the ass and/or your nutsack kissed forcibly due to the laws of gravity acting unfairly against the "FDK"
"He is the FDK of the group"
"What does that mean?"
"It means hes the Fat Dumb Kid"
"Well it fits..."
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