Definition & Meaning of "doofus"in English

What is the origin of the term "doofus" and how is it used?

"Doofus" is American slang that appeared in the mid-20th century, likely influenced by humorous or comic speech patterns, possibly echoing the sound of "doughface" or nonsense words. It came to describe someone acting silly, foolish, or lacking common sense. The term is used in informal speech, often teasingly or in lighthearted insults. It is mildly derogatory but generally playful rather than harsh or offensive.