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1.
A ghost penis is an invisble penis you can't feel. Every female has one, you just can't see it. You can look behind it though.
Can I see your ghost penis?
Why its invisble.
But i can see whats behind it. (pick up)


Ross has a ghost penis and i saw it today!(insult)

i have a ghost penis and a vagina!
by louiseandberyl February 11, 2009
 
2.
A clumpy fold in your pants that looks like an erected penis.

Origin:
Anthony Padilla from Smosh mentioned having a ghost penis in his video "the gym hates me".
"I hate when I have a ghost penis lump and it gets more awkward when a hot girl notices it and starts chuckling..."
by phantomimposter March 07, 2013
 
3.
When one becomes very high they may suddenly feel the urge to put two random words together and act as if they make a thought.
Person 1: Dude I am so high!
Person 2: Oh really, good for you
Person 1: I know I love it...oh hey did you do that homework?
Person 2: Yeah, what homework do you need?
Person 1: GHOST PENIS!
by El Senor Cheeto October 25, 2004