The term "GloryholeSwallow" seems to refer to a specific sexual practice that involves oral-anal contact. A glory hole is a type of sex toy or apparatus used for anonymous oral sex between individuals, often in adult bookstores or sex clubs.
The practice you're asking about appears to involve a specific scenario where an individual, likely a female, is engaging in a sexual act involving oral and anal play.
If you're looking for more information on this topic or related subjects, there are several reputable resources on sexual health available.