Printz Oskár up your mother’s

[Coffee Break]

Hello everyone. I encountered this expression, "Printz Oskár up your mother’s", but am struggling to understand it. Could you please let me know what it means in the following sentences:

We were speeding along the Drive when a car suddenly swerved into our lane from the right.
“Printz Oskár up your mother’s,” she yelled at the car.
Her BMW swooped over to the fast lane and sped up to the car that had cut in front of us. Clara stared at the driver in the adjacent car and mouthed another insult: Preeeeentz-os-kááááááááááár!

- André Aciman, Eight White Nights, Third Night

This is a novel published in the United States of America in 2010. This novel is narrated by the nameless male protagonist. The protagonist meets Clara at a Christmas party in Manhattan. Two days after the party, Clara came to the protagonist's house at 8 o'clock in the morning and is driving him to her friend, who knows a lot about recorded music. But some driver cut in front of their car, and she is giving an insult to the driver.

Here, I wonder what the underlined expression means.
I learned from this book that she is using a ship's name they saw during the drive, "Printz Oskar", as some kind of insult, but I am not sure what "up your mother's" might mean, especially when it is combined with another word.

I also learned in the dictionary that "up your ass" is an insult, so I guess it might be a similar expression to "up your mother's", but I am not sure...

I would very much appreciate your help.

 

[Skrej]

Yes, you could interpret it as a shortened version of 'up your mother's *ss' - the ship being the particular item to be so inserted.

Without being too crude, since she's referring to the driver's mother, you could also interpret it as a reference to another female specific body cavity, which carries another entire layer of suggestive insult regarding size of said alternate cavity.

It's like a two-for-one insult, all very crass and crude, as well as a personal attack.

 

[Coffee Break]

@Skrej,

Thank you very much for the explanation.
So this insult basically means to put the ship (Printz Oscar) into that person's mother's asshole (rather than the ass itself), or into another female body cavity of that person's mother.
It is a way to insult the driver as well as the driver's mother.
I sincerely appreciate your help, for letting me understand.