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.