Top Definition
This word is derived from a combination of the words "fail" and "phallus". This work describes a penis of such extraordinarily small size that it causes the viewer to utter the phrase "fail".
Timmy: *whips it out*
Betty: Wow, Fail.
Timmy: Aww, shucks. I have a Faillus.
by Jickua Pronuska June 25, 2010

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