Possible Clues:

• Offhand
• Frivolous
• Impudent
• Not showing proper seriousness, disrespectful
• Frivolous, off-hand
• Drink, long and light
• Shallow breath follows somersault
• Being facetious over pint flap
• 'A drink,' you gasp, being frivolous
• Irresponsible jerk with puff