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!
Mike: What did you do?
Jeff: What every civilized man would do! Took advantage of it!
by Draginack September 29, 2008

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)_/¯"
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 06, 2020

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!
Bob: hell no that's gross!
Everybody: (simultaneously) Loner Boner!
by Poonsquasher2.0 January 10, 2012

When she's "not in the mood".
Man, we were fuckin' all alone at my house.. Lights out.. Under a blanket.. And then I find out I've got a loner boner.
by AviatorsMan October 09, 2008

The phase where one enjoys being alone and not in a relationship. After being single for many years enjoying the lone times and fearing the loss of that if they get into a commitment.
by Socio-psychopath April 27, 2021

lonely
being by yourself
with no friends what so ever
pretty much having nobody next to you, to make fun of people with.
being by yourself
with no friends what so ever
pretty much having nobody next to you, to make fun of people with.
by potranquita June 06, 2005

You: "Dude that guy over there is all alone."
Friend: "He was just hanging out with us a minute ago."
You: "He had to leave the group cause he got a loner boner."
Friend: "Sucks for him"
Friend: "He was just hanging out with us a minute ago."
You: "He had to leave the group cause he got a loner boner."
Friend: "Sucks for him"
by kylejohnson July 08, 2010
