Plural of acidhead; multiple people who frequently use LSD or are associated with psychedelic drug culture.
Simple plural of 'acidhead' formed by adding '-s.' The term was commonly used in the 1960s-1970s to describe users and enthusiasts of LSD and psychedelic experiences.
The Beatles, Grateful Dead fans, and Woodstock attendees were sometimes called 'acidheads' in the media, and the term became so specific to that era that it's rarely used today—language markers of historical periods are fascinating.
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