Another basketball vote. Never heard it used in any other fashion. Triple double is also a familiar basketball term. Is there an equivalent coffee order for that? 
In-N-Out
I answered coffee in the poll, as it was the first thing I thought of, but the hotel thing is also valid as I’ve helped run conventions and that’s a big thing there.
I’ve only ever heard it as a basketball reference - double digits stats in two categories.
My first thought was In-N-Out.
My second thought was Little Ceasers. Pizza! Pizza!
Now I’m hungry for pizza.
this for me too
More than 20 points, and more than 10 rebounds, in a basketball game (for power forwards, centers, and some small forwards. Plus, Dwyane Wade.) Or, more than 20 points, and more than 10 assists (for point guards, shooting guards, and the rest of the small forwards.)
Never heard it used in the context of food.
Canadian checking in. Had no idea there was any other meaning for double double aside from a Tim Hortons coffee with 2 cream, 2 sugar.
I vaguely associate it with hamburgers. Can’t actually say which restaurant or what exactly it consists of, but burger was the first thing that came to mind.
But wait, isn’t it also slang for a woman’s butt? That’s an even vaguer thought so I’m probably confusing it with something else.
Isn’t that “double bubble”?
Toil and trouble.
As a California resident who doesn’t eat beef, who has familiarity with Tim Horton’s but doesn’t drink coffee and used to watch a lot of basketball but have never really played, a double double is three things I’ve never had.
But I know of the phrase from all three contexts.
I thought that was the name of the titties.
From the glossary at www.scrabble.org
DOUBLE-DOUBLE A move which spans two Double Word Squares in one go earning four times the value of the word played. Also called FOUR-TIMER.
Am also familiar with the basketball usage.
Another for “hotel room with two double [or larger] beds”. I was a desk clerk for years and this was consistent in the places I worked.
This thread is the first time I have heard the phrase.
10 points and 10 rebounds and on up.
Ten or more in two categories in a basketball box score.