An event occurring on Sunday evenings when the alpha-male suddenly realizes that his nightly escapades suddenly seem for nothing as he is completely alone, finding himself laughed in the face by his suddenly erect boner and no one there to disarm it. Hence loner with a boner.
Oh, Jeffrey... he may be a stud on occasion, but come the day after he is only a loner with a boner.
by Kimotep October 12, 2009
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a horny guy who has nobody to f*ck.
usually a loner with a boner will be a 40-year-old virgin.
*boy texts girl*
Jonathan: hey jess bby i'm soooooo horny right now so come over and f*ck me hard bitch ;) ;) ;) :*

Jess: ill be at your door in 5 minutes, sexy, horny and ready to fuck ;) ;) ;)
Jonathan: woohoo! im gettin laid! maybe im not such a loner with a boner after all :D
by ilovejess:D August 3, 2011
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A boner or erection that occurs in one's home, or in any other place alone. This includes when they are looking at porn or reading/thinking about something erotic. A Loner Boner can also occur when somebody unattractive is around, such as a parent. However, if you are with a girl (or boy, depending on your gender preference) and you get a boner, this is not considered a Loner Boner.
Jeff: Dude, I just got a total Loner Boner last night.
Mike: What did you do?
Jeff: What every civilized man would do! Took advantage of it!
by Draginack August 5, 2008
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An erection that occurs when standing on your own. These are entirely random.
The horse standing alone in the middle of the field had a giant loner-boner.
by i get bored sometimes. October 2, 2009
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anyone who gets a boner when alone or in a group of guys.
Ryan Nagel is a total loner boner
by michael and andrew November 6, 2010
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A loner boner is when you get a boner/masturbate to fictional characters because you're lonely and don't have anyone in real life
Guy 1 "Bro, I was playing Persona 5 the other day, and got a boner when i saw Futaba."
Guy 2 "Damn, i thought you said you had a girlfriend."
Guy 1 "I do."
Guy 2 "Then why did you get a loner boner?"
Guy 1 "¯\_(ツ)_/¯"
by visherin March 7, 2020
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When a person who has few or no friends and keeps to themselves masturbates.
It seems like all Jeff does anymore is hole up in his room and work out his loner boner.
by Verbal Platinum Princess April 25, 2009
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