A woman who has big breasts and no ass. A woman who is large at the top and small at the bottom.
"You have 36DDs and you wear a size 4 with no ass. You are an improper fraction"
by TUNE15 September 12, 2006
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1. (noun) Sex with someone so easy (or ugly) that they don't even count as a full notch on your belt. Similar to Fictional Sex, sex that's either made up to boost one's numbers, or falsely denied to reduce the bed count.

2. Sex that's so lousy, it doesn't even count as a full fuck.

3. Sex that's so amazing, or so difficult to score, it counts as several notches on your belt.
1. Bob: "Man, I fucked 1/3 of a girl last night."
Dan: "What do you mean? Where was the rest of her?"
Bob: "It was fractional sex, this chick named Amy. All I had to do was buy her one drink and she was back at my place. She was so easy, it doesn't even count as a full lay."

2. Krista: "How many guys have you been with, Amy?"
Amy: "Two and a quarter?"
Krista: "Two and a quarter? How do you fuck 25% of a guy?"
Amy: "It was this guy name Dan. He was so shitty in bed, it don't even count as a full lay. He had a little dick and he only lasted two minutes."
Krista: "Ah, fractional sex. I've had a few of those. I'm up to 3.4 I think."
Amy: "3.4, huh? Sounds like fictional sex to me. You're forgetting about those two guys you did on Spring Break, and that Jerry guy, and that professor you went down on, and-"
Krista: "Shut up! You made your point."

3. Will: "Well, it took me seven months, $500 in dating expenses, and four bullshit love poems, but I finally got Destiny in bed last night. And man, it was so worth it! She blew my fucking mind! I swear that counts as ten notches on my belt right there."
Steve: "Ah yeah, fractional action, huh? Nice."
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Refers to your Crew, Gang Or Boys.... C.A.L
Ma Fraction Gona Come Merk You Bredda!
by Runnin C.A.L Click Bwoi October 13, 2007
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An improper, or "top-heavy" fraction, one in which the numerator is greater than the denominator. The term is derived from Ms Katie Price (aka Jordan), a glamour model of quite extraordinarily enhanced proportions.

An intentionally misleading and yet correct statement as to the time taken to accomplish a stated task.
I'll be along to assist you in a jordan fraction of a second (Just as soon as I've finished this coffee).
by tony, not anthony May 11, 2006
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When the girls boobs are bigger than her butt
Man the other day I saw all these other chicks with big asses but there was this one irregular fraction with them.
by Lord Kingaling June 19, 2018
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Slightly smaller than Thomas Gaywoods already quire small penis.
I think the match bonuses on cod get fractionally pussier.
by wilko194 January 07, 2010
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A couple where the woman is larger than the man, either in height or weight.
Dave: Do you see that couple over there? She's enormous and he's thin as a rail.
Bob: Yeah, I always feel bad for guys in an improper fraction.
by maf54 May 05, 2010
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