Faillus
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.
Betty: Wow, Fail.
Timmy: Aww, shucks. I have a Faillus.