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1.
a musical genre... a blend of heavy rock music, sometimes referred to as "hardcore", mixed with Jamaican riddims.

"yard" is a word commonly used in place of "Jamaica"
("Mi come from yahd (yard)")Meaning: I come from Jamaica.

So yardcore is Reggae/Dancehall (or jamaican style music) mixed with hard rock.

Made popular by the FEAR NUTTIN BAND.
Known for mixing rock and reggae, Fear Nuttin Band, has created a new style of music they call "Yardcore".

If Buju Banton and the Deftones made an album it would be Yardcore.
by Matt Penza August 21, 2007
 
2.
means "hardcore," Its the name of one of the Born Jamericans' albums.
Yo, that Yardcore LP is the shit.
by linds May 09, 2004