Possible Clues:

• Final decision on most recent fashion
• Continue brief conversation to get final decision
• Final say
• It's 'zythum' -- that's a definitive statement
• *Ultimate authority
• What an arguer often wants (2 words)
• Ultimate
• It's very chic. I'll say no more
• Best possible example, or possibly worst, in boy's grasp
• Fat entertaining couple after start of spat? This ends the argument