Dreaming about a cucumber represents nutrients and water. In that sense, if you are cutting a cucumber, it means cooking a meal for your friends to enjoy. Your culinary life will be prosperous and fulfilling.
On the other hand, seeing a cucumber in a dream, could signify sensual feelings and longing for another. Cucumbers are usually euphemism for male private parts. Depending on the proximity of where the cucumber is to your body, that is where your desires are at its peak and needs your attention.