Serious Eats - seriouseats.com

Actually, I grew up in the west, so I had no idea about Crystal/White Castle until I was much older.

When I was in the Navy, the term 'slider' refers to all burgers, regardless of size/thickness/origin, mainly due to their tendency to 'slide' around the grill while the ship is rolling or pitching.

So, to me, when someone says 'slider', I don't think of a small burger, nor do I think of Crystal or White Castle, I just think 'hamburger', period. A 'slider' is completely non-specific.