The act of ejaculating in both optic regions, and thereby impairing vision/judgment. Henceforth the ejaculator (male) is no longer visible, and can exit without detection as the hopeless blind sticky-eyed victim (female) fumbles to clear the affected/infected optic regions. Successful execution of the invisible man can lead to eye pregnancy, or birth of blind/deformed fatherless offspring.
Doctor, I was the invisible man(ed) last night.
by West Mungshit September 28, 2007
When a guy is doing a girl from behind and switches with his buddy mid-course; goes outside (preferably by a window) and waves to his unknowing girlfriend from outside.
Hey man I just gave Cindy the Invisible man. She flipped shit
by Brectctct December 27, 2007
A means of keeping a baseball game going in the event that each team is so small (3 players or so) that a player who is already on base must go back up to bat. An invisible man is then placed on the base previously occupied by the person who has gone up to bat.

See Indian Baseball.
The bases are loaded, and we only have three people on each team. Let's have Tommy go back up to bat, and we'll put an invisible man on third.
by The Fourth Man in the Tub July 19, 2011
When two men are engaged in anal sex and the receiver has a sheet over him with an appropriately sized hole and anal ease lubricant.
Mike pulled the sheet over Ian and decided to engage in the "invisible man hole" position.
by JZenk May 9, 2007
A man who is a fountain of knowledge in the smart community, who R'edTFM
Where is The Almost Invisible Man (T'AIM) when you need him?
by Bifflediboff January 25, 2006
Phrase used to describe your friend or buddy that gets very touchy-feely when drunk.
Watch out for Handsy the Invisible Man after 4 Kettle One and Tonic's...he has 8 arms and will probably feel up your wife or grab some girl's tits along the way...
by B. Hanback January 18, 2009