Wingdinger means "sweet!" It's Irish of origin, referring to fairies that flew around with bells and were indentified with good luck. It is widely thought the wingdingers were the inspiration for Disney's Tinkerbell.

the thing that you don’t have when you’re phones percentage is over 20

A person who thinks that he/ she is proficient at gaining the attention of attractive individuals in a social setting (wingman) however, their proficiency is questionable and is mocked openly by the previously mentioned attractive individuals.