Where does glory-hole come from?
In the 1820s, a glory-hole was a slang term for a "junk drawer" (no, not that kind of junk). Other 19th-century uses include small compartments on ships and other small rooms along with some still-current specialized uses in glass-blowing, engineering, and mining. The glory, here, apparently goes back to a Scots word meaning "muddy."
... but that's probably not why you're here.
In the 1930s, we see glory-hole again as a slang term for a "junk drawer"—and yes, that kind of junk, as in the penis, with glory-hole as a vulgar nickname for "vagina." Glory, here, apparently alludes to sexual pleasure and hole, well, you can figure that one out. This glory-hole led to a different sexual sense defined in the 1949 underground Gay Girls Guide as: "Phallic size hole in partition between toilet booths. Sometimes used also for a mere peep-hole." The term may draw on an earlier use of glory-hole as slang for a "gay bar" in the 1920s.
In the mid-1900s, glory-holes were so cut into bathroom stalls in order to facilitate homosexual liaisons, among other places and for other reasons. With the rise of the adult-film industry in the 1970s, glory-holes were also found in specially-fitted booths in adult-video shops. The internet has since proliferated glory-hole as a pornography genre, especially for heterosexual sex acts.
Who uses glory-hole?
As noted, there is fairly sizeable subgenre of pornography dedicated to glory-holes and their vaginal variations. The term is often the subject of many jokes.
At confession today, the priest loved how long the line was and how enthusiastically the men confessed their sins... He'll be so disappointed when I confess that glory hole I made.
— ᏕᏇᏋᏋᏖ ᏗᏒᎮᏋᎶᎶᎥᎧᏕ (@AmandaEeeek) June 3, 2018
A glory hole but where you get to boop animals gently on the nose.
— H (@hari_miller) June 3, 2018
Given its sexual content, it's best to avoid glory-hole in polite company.
*feeds you churros through a glory hole*
@GinAndJif, May, 2018
Tell me how the two of you first met? Was it love at first sight (or glory hole)?
Ryan Shea, Instinct (interview), May, 2018
The spillway design chosen for Berryessa is variously called a bell-mouth, a morning glory, or — most commonly — a glory hole. It’s essentially a giant concrete funnel sticking up out of the dam, 75 feet in diameter at the top and 28 feet at the base.
Molly McCardle, Travel + Leisure, March, 2018