Body describes coffee's tactile impression: how light, substantial, oily or textured it feels in the mouth. It is possible to enjoy a clean, light-bodied cup just as much as a heavier one. Greater weight is a preference, not an automatic sign of greater quality.
Brewing and filtration strongly influence that texture. A paper filter tends to retain more oils and particles than a metal screen, while a French press or espresso preparation can present a different sensation. The bean and roast also contribute, but a brewing-method change may be more noticeable than an origin label.
Compare cups at a similar drinking temperature and with measured recipes. Ask whether the texture is silky, watery, coating or gritty, and distinguish those observations from simple intensity. A concentrated drink can taste strong without having the texture you want. If you dislike sediment, investigate filtration and pouring technique before rejecting the coffee itself. Describing body clearly helps you choose both a coffee and a preparation style that fits your preferred cup.
The conversation
A good question can make a better brew.