Tuli Kupferberg, the poet, singer and professional bohemian who went from being a noted Beat to becoming, in his words, “the world’s oldest rock star” when he helped found the Fugs, the bawdy and politically pugnacious folk-rock group, died on Monday in Manhattan. He was 86 and had been a longtime resident of Greenwich Village.

He had been in weak health after suffering two strokes last year, said Ed Sanders, his friend and fellow Fug.

Mr. Kupferberg was something of a Beatnik celebrity when he and Mr. Sanders started the Fugs in 1964. Already in his 40s, he was an anthologized poet and published a series of literary magazines with titles like Birth and Yeah. And to his chagrin and embarrassment, he had also found a kind of notoriety as the inspiration for one of the characters in Allen Ginsberg’s poem “Howl.” He was the one who “jumped off the Brooklyn Bridge this actually happened and walked away unknown and forgotten.”

Between 1965 and 1970 the Fugs released six albums of music that could be puerile (“Boobs a Lot”), politically provocative (“Kill for Peace”) or gentle and even scholarly (“Ah, Sunflower, Weary of Time,” based on a poem by Blake). The band became “the U.S.O. of the left,” Mr. Kupferberg once said, playing innumerable antiwar rallies, including the “exorcism” of the Pentagon in 1967 that was chronicled by Norman Mailer in his book “The Armies of the Night.”

In the years since the Fugs, Mr. Kupferberg has been a regular sight in Lower Manhattan, selling his satirical cartoons on the street and serving as an grandfather for bohemian types of all ages. He embraced the bohemian designation, tracing the word back to its origins back to 12th-century Paris, where “the craziest students once came from Bohemia,” he once said in an interview with the music Web site Perfect Sound Forever. Among his books were “1,001 Ways to Live Without Working.”

Lately he has been posting his sometimes ribald “perverbs” — brief videos punning on well-known aphorisms — on YouTube.

His survivors include his wife, Sylvia Topp; and three children.

A full obituary can be found here.