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An abbreviation for the phrase "Ponytail Boy" which describes a boy with a ponytail. His hair is usually slicked back & tied into a high, low, or half pony- whichever style is preferred by P.T.B.
1."My friend Lauren hooked up with a P.T.B. last night."

2."Mom, can I have a P.T.B. when I grow up?"

3.Jen: "Where have you been lately?"
Lauren: "Playing with my new P.T.B."
P.T.B. by meesh1216 April 1, 2009

P.T.B.U. ratio 

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.
P.T.B.U. ratio by Jack Metzler April 3, 2008

P.T.B.U. ratio 

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.
P.T.B.U. ratio by Jack Metzler April 2, 2008
Post Taco Bell Fall Out. PTBF is the fall out that occurs after eating an item from the taco bell menu. Symptoms of PTBF include upset stomach, diarrhea, and awkward gas. Eating Taco Bell almost always leads to some form of PTBF, except in the most rugged eaters. Often, it is worth experiencing the post consumption discomfort, because Crunch Wrap Supremes are just so damn good.
Friend (Finishes Burrito)- "Oh god I have to take a crap!"

Me- "Dude I told you you would get P.T.B.F"

Friend-"Yea but its so damn good though"
P.T.B.F by mdw1715 November 2, 2010

P.E.T.B.O.

Acronym used to describe a moderately attractive woman. As such she is "Pretty Enough to Bang Once".
Yeah I had her last night, but that's it . . . she's just a P.E.T.B.O.
P.E.T.B.O. by tagz May 18, 2007