Related Clues:

• Cool, in recent slang
• "With it"
• Like jazzmen
• Zoot-suited, say
• Terrific, to a bro
• Cool, in the '40s
• Viral inflammation, informally
• Cool, in the '50s
• Excellent, in modern lingo
• Hardly old-fashioned, in an old-fashioned way
• Cadence shout
• Hip-hop ''cool''
• Not at all square
• Good, to a rapper
• "In the old grooveroo"