An informal phrase used in some Spanish-speaking countries to refer to someone who is not active or doesn't go out often. Literally translates to 'smell of knee', implying that the person is always in a sitting position, hence their knees are rubbing together and producing a smell.
Examples
- Spanish: Juan nunca sale de su casa, siempre está jugando videojuegos. Ya tiene olor a rodilla.
- English: Juan never leaves his house, he's always playing video games. He already has a 'knee smell'.