When a person has the characteristics of a man, or a fish, or even possibly both. It can be used in many cases, such as describing an ugly girlfriend.
person #1- Dude, i cant tell if corys gf looks like a man or a fish.

person #2- i cant tell either. i think she looks like both.

person #1- ok, we'll call her manfish then.

person #2- ok. sounds good to me dude.

Person #1- *walks past corys gf* *cough* manfish *cough*
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Noun; That anatomical area found on a man located between the sphincter of the anus and the posterior portion of the scrotum characterized by the elevated subdural tubular shape formed by the urethra.

Coined by Ratface Holtzman circa 1990
"He smashed his manfish when he slid off the bike seat and landed on the bar."
by Mike G December 17, 2006
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The perfected ancient art of doing something really homosexual or odd, or something along the lines of jizzing in a public place. The art reaches its peak, in the part where after doing said act, you yell a random, confusing phrase at your company, and make a daring escape. The facts prove that moses led the israelites out of egypt by pulling a horny manfish. History's great escapes have all been, in reality, real examples of horny manfishes.

Please note that the word has nothing to do with the definition.
Holy shit he just pulled a great Horny Manfish!

Ha! After cumming on the table I have yelled GENGHIS KHAN and therefore pulled a horny manfish!
by JackysonQuagmire2therescue December 1, 2009
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