American EnglishAmE informalSTUPID/NOT INTELLIGENT someone, usually from the country, who has no experience of other places and thinks in a simple way – used to show disapproval 乡巴佬,土包子〔含贬义〕SYN bumpkin
Examples from the Corpus
rube• Never before had I felt so threatened and vulnerable, like a rube up from the farm for the first time.• Even in the place you call Twentynine Malls, the rubes are smart enough to figure that one out.• They had been standing around the table like two rubes with the senseknocked out of them.