To be dissed or to have had something unpleasant happen that you weren't expecting.
You've been Geoff'd
"While I was inside the store somebody Geoff'd my bicycle!"
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To be ahead/doing well in something, only to fuck it up at the last second and fail.
Origin: Geoff Ramsey of Achievement Hunter, who constantly causes himself to fail, no matter how hard he tries to succeed.
*While playing GTA V*
"I'm gonna win!"
*falls off the map, proceeds to be passed by everyone in race*
"Gah! I Geoff'd it!"