The phrase "to feed the pigs" means to waste or throw something away, usually something that could have been useful or valuable.
Sentences with «to feed the pigs»
Feed your pig morning and evening, not just once a day. (animals.mom.me)
Suddenly in need, he takes up a job feeding pigs in the field. (relevantmagazine.com)
Despite that fact we keep feeding the pig and starving other areas of the budget including transportation, higher education and public education. (nystateofpolitics.com)