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1.
Any function that seems manly to a group of testosterone and beer fueled men such as a truck show, car show, boat show, RV show or and such visit to a bass pro shop. It works well with a large group of men, that way it doesnt look like a date
Person 1:Hey did you hear? Jasons organizing a Man Function!
Person 2: Hell Yea! I Love You Guys In A Totally Non Gay Way.
Person 1: Me Too, Now rub Me down with deer scent
by Johnny "The Answer" March 28, 2010
 
2.
An unexpected event involving a piece of equipment being operated by a man when the man refuses to admit causing the event.
After I drank eight beers, the car manfunctioned and hit the light pole.
by swat0127 March 20, 2012