Top Definition
A fat starfish is a person, who after an extremely long day relaxes by laying about doing nothing for an extended amount of time. Resembling a fat starfish
Tim: Dude its been such a long day.
John: you should go relax
Tim: I'm going to relax so hard I become a fat starfish

Jake: Scott you're being such a fat starfish
Scott: ...
by Kalia talia November 19, 2013
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