The Brief: "Glizzy" is a slang term for hot dog.

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This term evolved from Washington DC slang from meaning “gun,” referring to a Glock, to mean “hot dog.” According to Know Your Meme, the term’s first known online usage in reference to hot dogs is in a 2016 YouTube video by Azel Prather.
@caden.idk i am the glizzy ninja #hotdog #glizzy #glizzygobbler #fyp #wack
Urban Dictionary defines the term “glizzy gladiator” as “one who exemplifies the gobbling of glizzy to a gigantic degree.” A synonym for this is “glizzy gobbler.”
@bigwood7 Comment who’s driving in the glizzy whip! #fyp #glizzygobbler #foryou #IAmLost
An ESPN commentator even referred to hot dog eating champion Joey Chestnut as “glizzy gladiator” at the 2020 Nathan’s 4th of July hot dog eating contest:
They just called Joey chestnut the glizzy gladiator 😭😭😭😭😭😭😭 pic.twitter.com/It81dgmfkv
— DZA3000 (@DZA3000) July 4, 2020
The term surged in popularity in June and July 2020, inspiring a TikTok trend where boys enthusiastically eat hot dogs. Other TikToks show people rating videos and photos celebrities and politicians guzzling hot dogs.
@kilzii are yall some glizzy gladiators? #FurnitureFlip #HomeGym #LegendaryChallenge #fyp #foryou #foryoupage
There’s also a rapper named Shy Glizzy.