noun: Any type of underwear that lets the bottom of ass hang out; exposing ones butt cheeks. eg Boy shorts/Booty shorts.
She has the nerve to rock them half-ass coverers when she ain't got no ass.
by Mike's Wifey May 15, 2005
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Castach is originated form an army term or more like it an initials of an army term called "Lechsot et Hatachat" which means covering your ass.
For example in many cases especially in voluntary armies a sergeant / commander doing things in order to say "I followed Procedure" that act is called "Castach" which is as mentioned "Covering Ass".
by hagzag August 22, 2005
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A ratio used in project evaluation in relationship investment management.

A prudent relationship investor in times of financial and emotional turmoil would seek the best relationship investment options to which he would invest his liquid assets. The criteria used in evaluations of said investment options are, but not limited to, the level of visible beauty, intelligence and ability to hold a conversation and body charactersitcs what for purposes of quick evaluation can be summed up in the form of 'boobs to ass cover ratio'.

Having said that, the 'boobs to ass cover ratio', or BTACR, is the relationship between the circumference of the said boobs over the circumference of the ass of the said investment option. The rule of thumb is, if BTACR<1, reject the option, and if BTACR>1, proceed.

The existence of this ratio is justified by the abundance of relationship options that entice investors with cleavage, displaying the acceptable boob circumference to mislead the investor, whereas the ass circumference is or may be much larger, and thus constituting a bad relationship investment option, dubiously named 'fat bird'. The options that satisfy the BTACR requirement are usually referred to as “large cup stocks”.

This information has been placed here for information purposes only and the authors accept no responsibility for decisions made based on the entry provided.
Bro #1: Oi Steve, have you seen the knockers on that girl right there?
Bro #2: Yeah, but the BTACR on that is lower than 1, you know I can't hit that enormous ass.
Bro #1: True dat

Guy at party #1: Have you seen the boobs to ass cover ratio on that bitch right there?
Guy at party #2: Well that ho is huge, you have to stop blindly judging bitches by ratios, I know you did finance in Pasadena Community College.
by InvestmentBankRejects May 29, 2010
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A method used to mask the identity of an embarassing booty call by comparing their looks to a celebrity.
Dude 1: "So what did that girl look like man! You slept with her and you're not giving me details!"
Dude 2: "Umm, she was ok... Kind of looked like Margaret Cho..."
Dude 1: "Dude, what the hell? Margaret Cho is not even fine, don't try that celebrity ass cover up on me doggy!"
by Da Vin Chee January 12, 2010
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noun: Any type of draws that cover the ass (this includes high/french-cut panties, bikinis, breifs, boxer breifs, and boxers).
Yo, how this bitch gonna wear ass-coverers under her white pants?
by Mike's Wifey May 15, 2005
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