The literal meaning of the word 'goy' is nation and even the
Jewish Nation is called this in the Torah. In modern Hebrew, the
word 'goy' has also come to mean 'non-Jew'. The plural of 'goy' is
'goyim'.
When a Jewish person calls you goy he/she is calling you non
Jewish. The word "goy" is not an insult. It is considered a neutral
word.