Alisan ng buto is a Filipino term which means to pit or to remove the seeds, particularly of fruits. Filipino fruits, like Pakwan (Watermelon), Atis (Sweetsop), Langka(Jackfruit) are just some of the examples of fruits with plenty of seeds, so before they are eaten or made into juices, their seeds must be removed (Alisan ng buto).
Buto is the Filipino word for seed, pit or bones, so "Alisan ng buto" can also refer to removing the bones of chicken or fish (particularly Bangus or Milkfish), for instance before it can be used for some cooking purposes.