dipstick

The technical sense of this word is neutral and purely descriptive, used primarily in automotive and mechanical contexts. It refers to the physical tool used for fluid measurement.

In contrast, the slang usage is derogatory and informal. Calling someone a dipstick suggests a specific kind of clumsiness or lack of intelligence, often implying that the person is a "numbskull" or an idiot. This usage is more common in British English and carries a tone of mild to moderate ridicule rather than intense hatred.