A “hocto dog” or “hoctodog” is an octopus hot dog. “Hoctodog” has been cited in print since at least 2007, when it described a hot dog cut into strips to resemble an octopus.
 
Eater—Washington, DC on December 29, 2017, described a menu item at Brothers and Sisters in the The Line Hotel, 1770 Euclid Street NW, Washington, DC:
 
The octopus hot dog at Brothers and Sisters features roasted octopus, yogurt, cucumber, and herb pesto sandwiched inside a potato roll. “I’m hearing people call it the ‘hocto’ dog,” Erik Bruner-Yang says.
 
           
The Lunch Encounter
Hot Diggity Dachshund Sausage!
Posted on July 23, 2007
(...)
Now for something truly gruesome, a hotdog octupus.
For instructions on making your own Hoctodog look here.
 
Twitter
daniel is rubbish‏
@DJDanielCoolJ
Hoctodog
(A hot dog is cut up to look like an octopus.—ed.)
5:48 PM - 15 Mar 2016
 
Twitter
Jessica Kerr
@jessitron
15 Aug 2016
Hot octodog #githubAndCheese
(A hot dog is cut up to look like an octopus.—ed.)
 
Phil Schalm‏
@pnomolos
Replying to @jessitron
Hoctodog?
8:39 PM - 15 Aug 2016
 
Eater—Washington, DC
D.C. Diners Embrace Sexy Cool Brothers and Sisters
The Adams Morgan newcomer is drawing in crowds
by Tierney Plumb Dec 29, 2017, 3:30pm EST
Adams Morgan’s long awaited Line hotel just celebrated its first week of service, injecting D.C. with a much-needed dose of hip hotel culture that displays sophistication and charm due largely to its debut, all-day eatery, the adventurous Brothers and Sisters.
 
The long delayed venture (1770 Euclid Street NW) moved closer to a full-fledged opening earlier this month by unveiling the first of five planned dining operations: ...
(...)
The octopus hot dog at Brothers and Sisters features roasted octopus, yogurt, cucumber, and herb pesto sandwiched inside a potato roll. “I’m hearing people call it the ‘hocto’ dog,” Erik Bruner-Yang says. Photo by Rey Lopez for Eater DC