Possible Clues:

• Snookums, e.g.
• Endearment, or what one gets from cat-callers?
• 6-Down, for one
• Honeybunch or cutie pie
• Sugar plum or sweetie pie, e.g.
• Sweetums, e.g
• "Snookie-wookums," e.g.
• Title used in familiar affection
• Cuddle bunny, say
• It may be said during baby talk