Some like it hot. Others like it Wayans, and those who do may very well enjoy the Wayans brothers’ new cross-dressing comedy “White Chicks” (PG-13, 103 mins.). An improvement over their spoof “Scary Movie,” and a great improvement over its rushed sequel, “Scary Movie 2,” the film is still overpopulated with fart jokes and “yo mamma” jabs. But the jokes that do connect (primarily in the middle half-hour) are often uproariously funny.

This particular collaboration (Keenen Ivory directs, Shawn and Marlon star, and all three – among others -write) concerns a pair of FBI agents, Marcus and Kevin (Marlon and Shawn, respectively), whose job is hanging by a thread after a recent failed bust. Their captain (Frankie Faison) punishes them by assigning them to escort a pair of waspy heiresses (Maitland Ward and Anne Dudek), believed to be targets for a kidnapping, from JFK to their Hamptons hotel.

Plans do not proceed as hoped, however. The Wilson sisters refuse to go to their destination, the foursome get in a minor car accident, and the siblings suffer a couple scratches on their faces. Trying to save their jobs, Kevin suggests that he and Marcus pose as the girls to fool their superiors, and perhaps catch the kidnappers themselves. Using a crack team of makeup artists (not mentioned once before or after their big scene), the agents deck themselves out in white face and attempt (though not that hard) to assimilate themselves into the white chick’s Hampton’s culture.

“White Chick’s” PG-13 rating often seems to be tying the film’s hands behind its back; the cast looks desperate to punctuate sentences with four-letter words, but they fall back on hit-or-miss gross-out humor instead: Chewing a hangnail off your own toe and spitting it into a glass of wine … not funny. Black men breakdancing while dressed as white girls … not funny. Inadvertently spreading your own vomit on someone else’s lips with your fingers … well, too each his own.

The Wayanses are in many ways following a path trod by another set of brothers, the Zuckers (“Airplane”). But one lesson of their films was that it’s all right if your spoof has no story – just don’t pretend that it does. Here, when Kevin and Marcus start doing some actual detective work, and uncover plot twists in a mystery that makes no sense whatsoever, the story starts to wander. Who cares who the kidnapper is? We want to laugh.