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Back ons 

Underwear that has been worn, discarded and then put on again.
He knew it was a mistake to wear back ons on the day of his wedding.

By the smell of things you're wearing back ons again...
Back ons by George Evans June 2, 2008

Back spaghetti 

The hair on the lower back of an oily, sweaty man.
Giovanni is a cool dude, but I didn't want to be seen with him at the pool party due to his back spaghetti.

You could tell Mario was lifting on this bench, he left some back spaghetti here.

Back Door Beauty 

An attractive women who likes to get it in the bum. dummper poop chute
I heard Sally is a "Back Door Beauty"
Back Door Beauty by Yaright October 8, 2004

Back to the Future Day

Celebrated each November 5th, Back to the Future Day is our opportunity to recognize Doc Brown's discovery of the Flux Capacitor, the device that makes time travel possible. Back to the Future Day is celebrated by wishing everyone a Happy Back to the Future Day, and updating your social media networks statuses accordingly.

On November 5th, 1955, Dr. Emmet Lathrop Brown (Doc Brown to his friends), was attempting to hang a clock in his bathroom. As he reached over, he lost his footing , slipped from the toilet that he was standing on, and struck his head against the side of the sink.

Unconscious, Doc had a vision. And that vision was that of a Flux Capacitor — the device that makes time travel possible.

Requiring 1.21 gigawatts of electrical power and to be moving at a speed of 88 mph (142 km/h) the Flux Capacitor allows one to move forward or backwards in time.

Dr. Emmet Brown, on this day in history, we salute you, and remember your red letter date in the history of science!
Back to the Future Day: The Origin Story
Dr. Emmett Brown: Then tell me, "Future Boy", who's President in the United States in 1985?
Marty McFly: Ronald Reagan.
Dr. Emmett Brown: Ronald Reagan? The actor? Then who's VICE-President? Jerry Lewis? I suppose Jane Wyman is the First Lady!
Marty McFly: Whoa! Wait! Doc!
Dr. Emmett Brown: And Jack Benny is Secretary of the Treasury.
Marty McFly: Doc, you gotta listen to me.
Dr. Emmett Brown: I've had enough practical jokes for one evening. Good night, Future Boy!
Marty McFly: No, wait! Doc. Doc. The-the-the bruise - the bruise on your head. I know how that happened! You told me the whole story. You were standing on your toilet, and you were hanging a clock, and you fell, and you hit your head on the sink. And that's when you came up with the idea for the Flux Capacitor... Which... is what makes time travel possible....

back squirts 

Involuntary explosion of brown ass juice into your panties and up your back.
I ate a bunch of gas station sushi and I had the back squirts in front of my mom.
back squirts by stuberts October 22, 2015

back dorothy

An elegant woman who enjoys receiving a ding dong in the ol' fart factory.
Good sir, the madam at the end of the wine bar wanted me to inform you that she would very much enjoy your man meat in her brown eye. She's a real back dorothy.
back dorothy by wirtydord March 9, 2015