The warm, pleasant sensations one feels in the stomach and heart area when emotionally moved by an act of goodwill or love.

Warming messages of friendliness or love to someone expressing a kind message to show gratitude toward one person or a whole group of people.

Warm fuzzy is singular for warm fuzzies

The opposite of warm fuzzy is a cold prickly.

when someone you love or close to you says or does something that gives you a tingling sensation, and melted or warmed heart, sends your heart racing to the heavens, even the "good" kinda of goose bumps! meaning can be used on a friend, loved one, or your boy/girl friend.