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1.
A device used in hentai games and anime to avoid showing a man's penis, thus circumventing Japan's censorship laws. Usually the penis is shown as transparent cylinder or as a beam of light.
This chained-up underage anime schoolgirl who may have been my sister was sucking my invisicock so hard I had to activate my tentacles before my orgasmeter was maximized. I'm sure glad real life doesn't resemble hentai games at all in any way.
by Phlegatu May 10, 2005
 
2.
The manhood of a very masculine woman. A contraction of "invisible cock", referring to a non-existent but very plausible possession of a dick on the part of a female, especially one seen as "one of the guys."
Zach: "Sally's such a man. She knows more about sports than I do."

Eric: "Yeah, she has an invisicock. You never see it coming."
by leggie_blonde August 15, 2009