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1.
The fourth man is the person who simultaneously tosses salad and licks the sounddock in a sounddock salad.

This is often used as a hyperbole.
I would rather be the fourth man the rest of my life than help you with your math homework.
by captb3a August 06, 2010
 
2.
Sounds like a cricket fielding position (perhaps akin to the run-saving third man), but really describes the unfortunate man who has to take double sloppy seconds as the result of a woman's sexual liberality.
Chris was at fourth man with Johanna, following on from Glenn, Bob and Patrick - but it was ok because, remembering his cricketing days, he did not neglect to pad up; this time with a rubber
by Scheisskerl August 21, 2012
 
3.
Fourth Man Furnace, greatest christian rock worship band EVER.
by Kacey August 26, 2004