1. superlative form of hippy; most characteristic of or resembling a hippy or hippie in style, attitude, or lifestyle
Usage: informal; often used to describe fashion, music, or cultural elements associated with 1960s counterculture

Examples

• That tie-dye shirt is the hippiest outfit in her closet.
• The festival had the hippiest vibe with folk music and peace signs everywhere.
• His long hair and bell-bottoms made him look like the hippiest guy at the party.
• She decorated her room with the hippiest posters from the 1970s.
• The band's sound was the hippiest thing we heard all summer.