The correct spelling of the word "spillings" is /ˈspɪlɪŋz/. The word is formed by adding the suffix "-ing" to the verb "spill". The IPA phonetic transcription shows that the first syllable is stressed and pronounced with an /ɪ/ sound. The following "-ll-" cluster is pronounced as a single /l/ sound. The final consonant "-s" is pronounced as /z/ due to the voiced sound of the preceding vowel. "Spillings" refers to the act of spilling or the things that have been spilled.
The word spillings does not have a separate etymology as it is simply the plural form of the verb spilling. However, the word spill comes from the Old English word spilian, which means to cause to fall or run over, shed (liquid), shed tears. It is related to the Old Norse word spilla and the Middle Dutch word spillen. The origin of these words is uncertain, but they could possibly be connected to the Proto-Germanic root spel, which means to split or to break.