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To make a whole group of people look like total idiots by messing everything up in the worst possible way, usually with a ton of bad decisions and some really bad choices.
Jacklorded the whole company by quitting mid-project and taking the office pizza with him.
The mayor jacklorded the city into bankruptcy by buying 1000 rubber chickens.
Jacklorded the team by showing up in pajamas and yelling at the printer.