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1.
Four really really really really good-looking guys that live together and are renowned for their sexual prowess with the ladies. They also by coincidence are all hung like thoroughbred horses.
Girl: OMG The Core Four just walked in

Other Girl: I know I can barley keep my legs closed

Third Girl: Me too
by The 923 January 19, 2011
 
2.
Many ask "What is the Core Four?" The core four is the name given to the four best friends who are practically gods in the world and they set their differences aside in order to succeed, they will never hold anything against one another...Ever.
They also play GTA V in the mean time. "Core Four Or Die"
The Core Four are the definition of Gods
by Corefour June 15, 2014