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2.
when a girl is aroused, it gives the effect of a phantom boner. It's like having a boner, only girls don't have penises, so they get phantom-boners.
Beth: "aaron and luke were so hot when they were making out!"
Becky: "I know! I got a phantom-boner!"
by Jake-Off September 03, 2007
 
1.
When the penis becomes erect but you can not for the life of you think why the blood is rushing to your phallus, then you are in possession of a phantom boner. It has no reason to be there, just like Hitler at a Bahmitzvah, It just shouldnt be there.
You are in church singing a glorious hymn, but why oh why are you pointing to the heavens? The phantom boner has taken over and wont go away for at least half an hour
by Keithmorreason November 16, 2009
 
3.
The same as "e-boner" which means being aroused or turned on without the physical effects of a full-on erection. This term can be used by either sexes, so it doesn't have to pertain to just males.

Mostly used in on-line chat forums. Also can be used in plural, which is meant to magnify the point tenfold.
Did you check out those pictures of that chick? Oh man, she gave me a phantom boner!

WOW! She has some big tetas! I'm a chick and she gave all of us phantom boners!
by acesandiegan February 04, 2011