upas 3 noun English. The stalk of a banana-type plant. Example sentence: Subanen. Naa iin laaki gaan getaw, gupas saging, muka' gutay. English. Now the only food people had was the stalks of cultivated and wild bananas. upasupas noun English. A pale grey, medium-sized, edible mushroom usu. found growing on fallen, rotting banana stalks. Generic. tubu'