The message engraved on the casing of the bullet that killed Charlie Kirk is used in trolling and “furry” subculture — and experts told The Post on Friday it was written by someone likely chronically online.

The casing had the words, “Notices Buldge OWO what’s this?” on it, according to an arrest affidavit targeting suspected assassin Tyler Robinson, a 22-year-old trade-school student from Utah.

The string of words can be used for trolling — and connected to online furry and role-play groups, digital culture experts said.

“Notices buldge” is a meme that shows two guys, including one with cat ears on, sitting across from each other over the computer in what could be perceived as an instance of catfishing, said Queens College media studies Associate Professor Jamie Cohen. 6

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