When a person (probably Indian) eats large quantities of curry so frequently that their cum begins to taste like it. This also leads to a spicy stench of the general crotch area hence, curry crotch.
Chad: “Hey man, did you hook up with Anushka at that party last weekend?”
Brad: “Yeah bro, but I regret it! She got that curry crotch going on!”
Chad: “Gross! well I hope you brought a bowl of rice to mix with it!”