Astounded; taken aback. Surprised by something you find annoying or bothersome. Also a satirical way to say you’re surprised when you really aren’t.
“Wow~ I’m so jabblegoffed right now! Scared out of my wits!” (Satire)

“Why’d you jump out like that?! Had me jabbergoffed…!” (Genuine)
by Maverick ㍃ March 2, 2022
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