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in the act of being, looking, dressing, or sound like yoshi.

AKA the nintendo little green dinosuar
:::dude in yoshi coustume:::
person 1: d00d l00k at that yoshi costume is so yoshicore!
person 2: yeah but l00k at the guy's dog is has a yoshi costume and is waddling around like yoshi
person 1: oh now THATS nintendocore
person 2: hell yeah
by lolcat August 18, 2007
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