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A bet that pays off big or just something that is awesome. Comes from the racetrack, where a winning bet on a big ticket pays so many zeros that it looks like the dots on double sixes ("boxcars" in dice). Can be used in combination with ship it.
Man, I hit that moneyline parlay and it paid boxcars.

Dude, did you see that girl's ass? It was boxcars.

Guy 1: We just scored an 8th and it's nuggy.
Guy 2: Boxcars.

Guy 1: That slampig wants to f you later
Guy 2: Boxcars, ship it.
boxcars by smart money February 13, 2006
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Crazily stupid or idiotic, insane. Used to describe a person entirely lacking in common sense.

crazy, stupid, retarded, insane, half-baked, witless, a few crayons short of a full 52
That guy is boxcars, he just dropped his ipod in the toilet.
boxcars by Van's Little Wing May 18, 2011

empty-boxcars train of assurers 

Derisive term for a sizable number of acquaintances of someone with a dubious reputation who make praising statements about the individual's character/morals, offer to co-sign a loan he's requesting, etc., but who are of comparably-questionable integrity themselves, are also broke, etc., and so their own word and/or reliability is viewed as not being much more of a legitimate guarantee than the promises of the person they're vouching for. In other words, "quantito, but not qualito"... lots of impressive-looking "containers", but with no actual/tangible/legitimate "goods" inside of said containers.
Loan officer: I always feel really wary/suspicious whenever someone of unknown/questionable reputation asks for a loan and offers to bring in a number of other folks to vouch for his character, reliability, and financial responsibility --- "methinks he doth protest too much", plus usually his so-called "witnesses" appear to merely be an "empty-boxcars train of assurers"... they seem no more trustworthy than I would view the loan-requester himself as being, and so their voluminous praise/recommendations hold little significance and inspire little confidence in me regarding whether the loan-requester would actually possess adequate means/motivation/dedication to repay the money. I feel something like how the lady-attorney in "Losing Isaiah" did when she pointed out that the members of the "support group" whom ex-druggie/shoplifter Khaila had named as the people who were assisting her in her efforts to "go straight" and "live clean" had themselves all been former drug-users and/or criminals, and so she felt that they should not be considered to be viable/reliable helpers to prevent Khaila from relapsing.

Boxcar Social 

1. A party or social gathering often taking place inside an abandoned or otherwise derelict boxcar.

2. A party hastily thrown together by hooligans, usually involving depravity and debauchery.

3. A party or social gathering where everyone dresses up as newsies and flappers.

4. A race with contestants dressed up as newsies racing vintage pedal cars.
Mr Kemp invited me and Atticus to a boxcar social tomorrow evening.

Some old friends are holding a boxcar social but I don’t know if I will go, the cops usually show up and ruin the fun.

A boxcar social is being held a few blocks away. Would you like to dress up and head on over?
Boxcar Social by gypsywrangler January 2, 2022

philadelphia boxcar 

the act of having sex with another persons colostomy hole.
there was this old man who had surgery so that he had to use a colostomy hole in order to poop, and he would go down to the jail yard and sell his colostomy hole for 5 dollars to the inmates so that they could fuck it. the man is from Philadelphia and his colostomy hole is packed like a boxcar so that is why its called a Philadelphia boxcar.

boxcar haircut 

A haircut popular with teenage boys in the 1950s: Longish on the sides combed straight back and with a flat top wiffle pushed up in front with butch wax.
My girlfriend thinks I look like a TV star with my boxcar haircut.
boxcar haircut by Allen109 May 22, 2017

Box Cars 

In craps (dice), slang term for throwing two sixes (at total of twelve).
Damn, I threw box cars!
Box Cars by The Doctor January 9, 2005