A relationship of a couple owning just one penis. This implies presumably also the ownership of a vagina.
Patricia and James live now together. They started a regular single penis relationship (SPR) after some turbulences. Cp. to Double Penis Relationship (DPR) and Zero Penis Relationship (ZPR).
by ThePhysopher September 25, 2016
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<Xyrena> So... Anyone got anything special planned for The Scrutinization of Single People Day?
20:41:17 <SD> trying to get laid any way i can cyber or other wise
<DragonLord> lol
* Xyrena nods
<Xyrena> Yup.. Seems to be the idea of it all.
by Mandy Blevins February 06, 2006
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single string meat banjo

I walked in on my mom playing the single string meat banjo!
by Denhamj February 21, 2018
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my new rap single

when you come up with a fucking stupid rhyme so you make a 3 minute song where you read them out in a monotone voice as a garage band beat plays in the background.
Riley: "Boba Fett, Boba Lett, Boba want, Boba get.
Boba’s son, Boba’s gun, Boba lost, Boba won.
Boba sperm, Boba squirm, Boba eaten by a worm.
Boba chew, Boba true, Boba coming for you.
so yeah that's part of my new rap single."
Everybody else: "what the fuck is wrong with you."
by mynewrapsingle October 05, 2018
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Literally Every Single Day

Junsei’s Birthday
Literally Every Single Day:
Happy Birthday Junsei!
by Assass1nSquad November 07, 2019
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Single-subject Friend

A person in your social circle who only talks to you about one subject and never deviates from said subject.

A.K.A. SSF

NOTE: The single subject does not include talking about one's self.
It's like when you meet someone and talk to them about bittorrenting and they do nothing more than talk to you about bittorrenting regardless of how you try to move the subject to another conversation, hence they are a single-subject friend.
by flippedlid July 13, 2010
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