Top Definition
An ileus is a partial or complete blockage in the bowels that can cause pain, a distended abdomen and the inability to defecate. A "gerbileus" is an ileus specifically caused by a gerbil.
Renaldo had not pooped for days and his abdomen was distended. He suspected it was the gerbil he had allowed Pedro to put up his butt the weekend before but needed an x-ray to confirm the diagnosis of: "gerbileus".

Although never confirmed, there was a rumor that a certain famous actor enjoyed the occasional gerbil up the tailpipe until one day it went in too far, creating a "gerbileus" that had to be surgically removed.
by Pammie Cakes November 18, 2011
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