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An extra pocket sewn into the inside of men's underwear so that older men can have their scrotum supported.
Grandpa was hanging so low he needed a boxcar so he could wear his shorts.
Boxcar by TruckdrivingMonkey June 29, 2014
One of those disgusting looking rectangular vehicles like the Scion xB. Most people would never buy such an ugly thing, but some just have strange tastes and preferences
The Laguna Beach youth parked his new Scion xB boxcar in the cul de sac, where it became an eyesore to the neighbors
boxcar by Boxcar Bob November 7, 2008

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

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

boxcar kid 

Someone who doesn't wear socks with fake retros
Dylan wears fake retros with no socks. What a boxcar kid!
boxcar kid by Boxcar Billy May 17, 2016

boxcar willie 

The trainride was boring, til my girlfriend and I did the boxcar willie in the dining car.
boxcar willie by ezcccc May 17, 2010