1. superlative form of groovy; most groovy; extremely cool, fashionable, or enjoyable
Usage: informal; dated slang from 1960s–1970s; still used nostalgically or humorously

Examples

• That was the groviest party I've been to all year!
• The groviest thing about the 1970s was the music and fashion.
• He thought his new car was the groviest ride on the block.
• That's the groviest outfit you could possibly wear to the disco.
• The band's groviest album is still their most popular one.