dieseled

(verb) To unknowingly add grain alcohol to someones beverage; in spite, revenge or as a gag.

"Meredith ordered a drink at the bar, but after failing to tip the bartender, he dieseled her drink when she wasn't looking"

"Zach was getting on the bartenders nerves and on the verge of getting kicked out, so Austin dieseled him to finish him off and called in the bouncer"

Eric: "Why is Ryan puking inside that washing machine?"
Gordon: "Because we dieseled all of his shots the entire night."
Eric: "WOW, He is super blacked out."

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