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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 04, 2008
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2
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 02, 2009
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4
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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5
When you think something or someone is hot so you get a boner, but nobody else has a boner or thinks it is hot.
Bill: ah, that's hot, you got a boner too?
Bob: hell no that's gross!
Everybody: (simultaneously) Loner Boner!
by Poonsquasher2.0 December 28, 2011
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7
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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