A sword penis is a term used to identify a man's penis after he has enjoyed lancing a woman's vagina while she is on her period. Upon withdrawal of the penis, said penis is covered in blood, hence it appears like a sword after it has been removed from a deep, incisive, bloody wound.
Keelay.

Example Sentence: I left her limp and bloody. And all she could say in her ecstatic, wounded stupor was, "Thank you, Sword Penis. Like Jesus before me, you have Knighted me with my own blood."
by Sex Mafia December 12, 2011
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A sword tattoo, that most people get down there spine; Between their shoulder blades. So, that when you wear a shirt the handle slightly sticks out and gives the illusion that there is a penis tattoo on the back of your neck. We would advise you to get that fixed. Don't get lice.
"Hey Jim, I didn't know you were gay."
"I'm not, Bob, it's a sword I got when I was smashed."
"Well Jim, my old lady and I would call that a penis sword tattoo."
"No way. Really?"
"Oh yeah, man."
"Oh, umm, I need to fix it so..."
"Wanna get some drinks?"
"Yeah."
by The Panchoco's May 1, 2010
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