Yidcore is in fact a derogatory term for Jewish heavy metal mixing the Jewish beliefs with "hardcore" heavy metal. Yidcore may also be known as yidXcore.
Some yidcore bands are System of a down, Venerated, Betzefer, Orphaned Land, Salem.
Person 1: I am going to listen to the new Venerated album
Person 2: I didn't know you liked yidcore.
Person 1: I have only hared some yidcore like Salem and Betzefer, could you recommend me something else?
Person 2: Try some Venerated, they are awesome yidcore.
Formed by the contraction of the words Yiddish and Hardcore to create Yidcore - a style that is used to denote bands who either are of Jewish origin, theme or who carry a Jewish message within their songs.
Examples are such bands as Opacus and Archaicus (Britain's foremost Yidcore bands), Aversion, Disturbed and Burzum.
2) I love how Archaicus adore our Lord, Yaweh. Because of their beliefs they decided to become a Yidcore band along with the likes of Aversion.
3) My favourite genres of music are Heavy metal, Nu Metal and Yidcore.