one-way feldman 

A person who routinely receives help/favors from his friends, yet is never available to return the help/favor.

“I bet I helped George move at least six times in the last three years, but now I need some help moving, and, as always, he has some lame excuse. Man, what a one-way feldman!”

one-way feldman by PittFan90210 October 19, 2006

one month stand 

when you see someone for couple of weeks or months, and when turns out that the person is really into you, you realize you have absolutely no feelings for her/him. the one gets a broken heart and you get an enemy. involves terrible moral hangover and everybody thinking you as an idiot.

"I had a one month stand with this girl and now her friends keep bugging me telling me how awful person I am."

one month stand by plaoto July 13, 2009

One Year 

One year can mean a whole lot of things. People can change, get fat, marry someone, have yet another heartbreak just to fall back in love with the same person. It can mean an addition to the family, whether its a 4 legged friend or another human. It can mean that you will get older, taller and wiser. It can mean that your summer love from 1985 won't love you in 1986.

x: "Dude...what happened?"

y: "Its been one year. I've changed."
x: "You're not you."

One Year by Phillip Wong July 28, 2010

One-Kleiner 

Noun. A brief exchange of information in which an individual uses the false pretense of authority to make guarentees and promises which indirectly cause isolated pockets of chaos to occur.

Bob: "They thought I worked at the store, so I gave them my absolute guarentee that for the next half hour all of the loose candy they could grab was free."

Sam: "Wow, nice one-kleiner"

One-Kleiner by Dr. Why August 18, 2010

one-arm 

While engaged in the act of sexual intercourse, the guy who starts on the bottom with the girl riding him places his arm around his partner’s back and deftly scoops her turning her around and underneath him without slipping out. At this point the guy is now on top and assumes the missionary position. For this to happen smoothly the girl should be fit and not overweight as it is much harder to one-arm a 300 pounder.

My buddy Chris met the hottest chick last night! She was so fit that he was able to one-arm her with ease.

one-arm by mducrane April 16, 2011

One Donut Short of a Dozen 

Some one who is one donut short of a dozen is basically missing a key element to their brains. A.K.A., they are stupid.
One egg short of a dozen works too, but that sounds nasty.

P1: Look at Anna- ew, why is she hugging that cardboard cutout?
P2: Oh, she's one donut short of a dozen. She thinks that's her boyfriend.

One Donut Short of a Dozen by leigh_12 November 27, 2011

One Eternity Later 

If you read this in a normal accent you have not watched Spongebob

ONE ETERNITY LATERRRRRR

One Eternity Later by Lachdanan February 18, 2019