A play on the similarity of the phrase 'the boot' and the title of an acclaimed movie about a WWII submarine ("Das Boot" or "The Boat" in english). Used in the same way, as in get the boot or as in the Denver boot. Sometimes combined with check your oil for extra comic effect.
Dude, I got so hammered last night that the bar gave me Das Boot!
I came back from the bar and found Das Boot on my car.
You: Have you seen Das Boot?
You: Leave me alone or (lifting your leg to show your shoe) I'll check your oil with it.