'Dek' means relish or sauce in Acholi and 'ngor' means cowpeas, so the name simply means cowpea sauce; pigeon peas, called lapena, go into a different dish.
Dek ngor mashes boiled cowpeas with a mingling stick until creamy, then stirs in simsim paste or peanut butter to make a rich, nutty sauce eaten with kwon kal or rice.