Verb: "To make false promises about what you can contribute, only to show up with with little or nothing." Noun: "One who does the foregoing (also, "rockfucker")." Refers to the idea of being
particularly screwed over by an unfulfilled or
exaggerated promise. Origin unknown but maybe
inspired by formations like "ratfuck" and "assfuck."
"The Army recruiter we invited to Career Day said he'd bring a pack full of gear
for the kids to look at, and then he rockfucked us and showed up with bupkis and a handful of pamphlets."
"Steve said he knew a guy who knew a guy and so there'd be at least two kegs at
the party, but he rockfucked us big time and just showed up with a 12 pack of
White Claw and a bottle of Cranberry Moscato."