Simple past tense and past participle of chug.(verb)
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Use "chugged" in a sentence
"Following the convention's closing ceremonies, which amounted to Mr. Wurzelbacher and Mr. Izjit sharing a box of Moon Pies and a liter of Dr. Pepper while listening to cassette tapes of Lee Greenwood and Anita Bryant, the pair put the "Gone Fishin '" sign on the door and adjourned to a local tavern where they "chugged" shots of Rebel Yell and bottles of Pabst Blue Ribbon beer until insensate."
"Ed chugged his scotch and reached for another bottle."
"I chugged a glass of tap water and poured another."