Something so unexpected or outlandish that you shut down for a second. Usually without clarification from the speaker.
Bill: "I was eating these really good chips that I found at Dan's house but I didn't know the name. turns out I was actually eating his cat's shit"
Hank: "..."
Bill: "...so I was at the arcade the other day..."
Hank: "What the fuck dude? you're just gonna drop a mental flashbang like that?"
by dpgf April 16, 2021
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