1. Queer old gentlemen from the 1950s who sit in your backseat for a living. They will certainly die if they are separated from the backseat. If you work for The Car Service and a backseatsman appears, you can never pick up anyone else again (unless he is asleep or has Downs Syndrome). They are also lacking severely in yo-yo skills.
2. See also: The Lonely Island.
1. "You work for The Car Service! There'll always be another fare!" exclaimed the backseatsman.
A person (usually a male) that appears magically in the backseat of your car while you're driving. They aren't very populartoday, but were very popular back in the 50's. Very few these days have encountered a Backseatsman, but those who have will never forget their experience.
When a guy asks a girl to hang out and “for a drive” (usually at night) he is most likely trying to to backseat her. It goes something like this... he proceeds to park somewhere and starts kissing the girl. Then he asks the girl if she wants to go to the backseat so he can fuck her. This is backseating.
Person 1: “Jake asked me to drive around last night and ended up backseating me”
Person 2: “What did I tell you about going on drives with guys at night! They always try to backseat!!!”
Another example...
“I’m getting so horny and this tinder guy asked me to drive around, I’m soooo down to get backseated tonight!”
Another one...
“Fuck I asked this girl to go for a drive last night and she said no; I think she knows I’m going to backseat her yikes :/“
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.