abbreviation for "Potential to Blow Up ratio", which is a scale ranging from 1 (low) to 10 (high), that rates the chances a currently hot girl will someday gain weight and become overly chubby and unattractive.
Key note: One night hookups are exempt from the P.T.B.U ratio as the girl being rated is usually hot, and even though she is likely to blow up in the future, the aforementioned potential blow up will not effect her current hotness.
Tom: "Check out that chick over there... she is smoking hot."
Brent: "Dude, look her thick upper arms and those kankles, she's got a high P.T.B.U. ratio.
Tom: "Man, who says I'm proposing? Bang it tonight, leave it tomorrow.
A term used to define how many days a week your partner expects to have sex. See example below...
Joe: So Gina, how many days a week do you expect to have sex?
Gina: I'd say about three...
Joe: Right, so your sex ratio is 3:7...
Gina: What the f**k?
This is a definition of how a girls leg to boob ratio stacks up. You do not take the face into account. First you look at the legs of a girl, NEVER trust the calfs. So it is from the knee upwards. You are looking for, tone, shape and general smooth/sexyness. You then move up to the boobs. The bigger the better! The reason you look at the legs first is to filter out any poor calls, i.e. by giving a girl a good ration only to find out she has legs like a Roman Legionair which is never a good thing. You give a mark out of 10 and carry on with your day.
A mathematical relationship between the potential amounts of pleasure versus competition in any given point in space-time, as denoted by the ratio of male participants to female participants, or more precisely, penises (wangs) to vaginas (chungs). The lower the wang-chung ratio the higher probability that a given social event will be successful.
Jim: Dude, let's go on chatroulette and talk to some hot girls.
Bob: No way, the wang-chung ratio on chatroulette is like 10,000 to 1.