Top Definition
The ultra-class size breasts of women within the realm of japanese pornography.
J-cup stars are awesome. Some of the best are Matsushima Marina and Ohura Anna.
by Blake J-Cup Fan November 07, 2005
One of the best damned boob sizes ever. Famous amongst Japanese bikini models and porn stars.
My last girlfriend, for example, had j-cups. Best titty fuck ever.
by R4wr July 18, 2006

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