Chocha refers to the beautiful honeycup known as the female yoni. It is an ancient Taino (indigenous peoples of Puerto Rico) slang word which calls to the English-speaking mind a conch. Nay, it is that sweet human shell from which we all came. If you're still at a loss, it's a twat.
When paired with the word "beach" the phrase becomes a euphemism for swimming in the seas of said sweet human shell, or, as the kids say, muff diving.
One can go to "chocha beach" but one can still fail at it in general. One who swims particularly well at "chocha beach" is a blessed, blessed soul for whom there are no limitations. Yea, verily, they are to be treasured.
One would be remiss to not mention the many Eastern Sea Board residents who commonly refer to the polluted Orchard Beach as "Chocha Beach" for it's foul odor. But that is a hateful expression, playing upon the false notion that women be nasty.
"Gurl, I could tell he hadn't had many swimming lessons when he went to Chocha Beach last night."
"I'm telling you, muthafucka best bring out the floaties because he owes me some deep sea diving at Chocha Beach."