The phrase keep that thing on me is American slang for carrying a weapon, and the clip turns that slang into a reusable meme format. It spread through short video edits and soundboards where users pair the confident line with an unexpected reveal, from toy guns to snacks and school supplies. Because the wording is vague, the thing can be anything, which keeps the joke flexible. It remains popular for reaction videos, gaming clips and parody flexes where mock seriousness is the whole point.