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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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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When you miss your pork pal so much just thinking about her/him gives you an erection.
"WTF man? Why are you pitching a tent around me?"

"I was looking at one of Crystal's pics. She's in Chicago and now I've got a loner boner!"
by ThePariahDog April 15, 2012
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A boner that appears without warrant and often by itself with no other boners around. I.E, a boner appearing at a strange time that no other man would find sexy.

A spontaneous boner, if you will.
"I was in math class and got a total loner boner. Had to cover it with my text book."
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a person who usually shows up to places/parties by themself, alone, and with no friends at that time.
I usually go to hip hop shows by myself, but I hate going to places by myself, I feel like a loner boner :(
by potranquita June 2, 2005
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When someone is so lonely and haven't gone out of the house for days when they begin to find the silence sexy they might get a loner boner.
Guy: I haven't been out for ages! I'm so horny, and its so quiet in here...oh god no I feel a loner boner coming on.
by Clever Locust April 25, 2013
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