Goofball/ˈɡuːfbɔːl/ Definition 1 of 2Pro Tip 1/3Informal Usage Used among friends in casual situations, not in formal or serious contexts. At the party, Mike was being a total goofball to entertain everyone. Pro Tip 2/3Affectionate Tone Often expresses fondness rather than annoyance; it's usually a positive term. You're such a goofball for always telling dad jokes. Pro Tip 3/3Not Insulting Generally not used to seriously insult someone; carries a light-hearted connotation. Even when she trips, she's a goofball about it and laughs it off.