Definition & Meaning of "plonker"in English

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

"Plonker" is a British slang term that appeared in the mid-20th century to describe someone foolish, incompetent, or clumsy. The word comes from a sense of being awkward or heavy-handed, extended to describe a person's behavior. It is used in informal, often humorous or teasing contexts, including conversation, television, and lighthearted criticism. The term is mildly derogatory but usually playful rather than harsh; its offensiveness depends on tone and context.