If you dream of seeing yourself as fat, it indicates that your livelihood will depend on your children's income. If you eat the fat of an approved animal, such as sheep or cat, in your dream, it may symbolize abundance and prosperity in your life. Such dreams can inspire you to make the right decisions for your family's improvement and future.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Fat" (page 154).
If one sees himself having a fat taillike that of a sheep in a dream, it means that his livelihood will depend on the revenues of his offspring. If one eats the fat of a permissible animal (sheep, cattle, etcetera) in a dream, it means profits or owning a sizeable business. If one eats the fat of a non-permissible animal (beats, vultures, etcetera) in a dream, it means earning unlawful money, committing adultery, rejecting one's religion or fostering forbidden acts. Using fat as medicine in a dream means recovering from an illness. Fat in a dream also means joy, happiness or festivities. In general, fat in a dream also could be interpreted to mean clean money, or net profits from which nothing is wasted.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.