1. n - The part of skin that is sometimes flabby underneath one's chin.
2. v - To tap someone's waddle with your hand, flat and outstretched, in an upward motion. Like tapping someone on their shoulder but in the opposite direction.
Waddling can be the most annoying thing if employed correctly. Getting a revenge waddle is required. Lightly tapped waddles can be more annoying than jaw-breaking ones.
Defending against a waddle can be employed by pressing chin up against your chest... which tires out the lower facial muscles. Or one can make their hand flat and touch the fingers of their hand to their waddle (noun). It's like defending the eyepoke from the 3 Stooges except you put your hand under your chin.