Simple past tense and past participle of gack.(verb)
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Use "gacked" in a sentence
"If you follow the chain of responses you will see that I did not jump in to defend the guy who got “gacked”, he jumped in to defend me."
"No reply to me, but you jumped right in to defend a droid who got gacked."
"It was kind of refreshing that The Dark Knight actually kept Rachel Dawes around as a character, rather than having her exit stage left (or be gacked in the first ten minutes)."