You might use the adjective mushy to describe an overripe banana or a tear-jerker of a commercial. Either way, it describes something soft.
Mushy is a good word for talking about something that's doughy or pulpy, whether it's a hunk of modeling clay or your out-of-shape belly. Another way to use mushy is to mean sticky and sentimental, like a mushy love scene in a terrible movie or a mushy greeting card. Either way, the word comes from mush, or porridge, which originated from mash, or "soft mixture."