Google '23 Skidoo', and you can immerse yourself in the variegated etymology of this American idiom.https://23skidoopostcards.wordpress.com/
... The 23 Skidoo Postcards blog
What is impressive about this card, aside from the lovely, clever line art drawing, is how quickly (copyright 1906) it followed what we would now call the idiom going viral.
The outbound cds, inbound cds, and flag cancel are a nice bonus.
Q/ Do you
know more about the artist E.H.J.?