The external opening of the male urethra, appearing as a slit at the end of the penis. Perceived by Europeans to resemble the eye of a Japanese man, some consider the term racist, but it clearly isn't, because Japanese men have them too.

Takahiro's attempts to find medical attention for the burning sensation in his Jap's eye were initially thwarted when he was directed to an optometrist.

by Urban Keith November 03, 2013

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Jap's eye

British slang <n> (Offensive)
The only externally visible part of the urethra on a male where semen and urine is secreted from the body.
Known as a 'Jap's eye' due to the similarity between the shape of the stereotypical Japanese eye and that the opening on the penis is much like a slit.
Although the phrase is not used in a directly racist manner, people of Far Eastern origin may take offence to the use of the term.

"Jeremy inserted a drill bit into his Jap's eye and proceeded to utterly maim himself."

by Stuart Fletcher November 03, 2004

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