Top Definition
An awkward looking, uncoordinated fish that unintentionally runs into walls and other obstacles. Also used to make fun of a person who is uncoordinated.
Guy: Dude, he runs into the wall all the time, it always makes things really awkward.
Girl: Sounds like he's a Siedlecki Fish.
by TheUrbanTurbanDictionaryist December 07, 2010
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