Simple past tense and past participle of grief.(verb)
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Use "griefed" in a sentence
"The event made news in the mainstream media, too, and not long afterwards, the HQ was "griefed" or vandalized, which created an even bigger splash."
"A hometown paper remembers the one-year anniversary of a teen who committed suicide after being "griefed" on MySpace."
"Most of the cases of shock, outrage, and character-mourning I've seen have been because the "griefed" player didn't think he was playing that sort of game originally, didn't expect that to happen."