He is asking if the rumor about the Turning Japanese song is a masturbation joke is true or not.
Fun tangential fact: Billy Squire's The Stroke is about nothing sexual whatsoever; it's about the music business.
Oh yeah, also:
Robot nurse: "Are you ready to operate, doctor?"
Robot doctor: "Yeah, but first I have to perform surgery."
Zoidberg: "That's my joke! I'LL KILL YOU!"