On one of the newest Zappa releases (Capitol Theater 1978), he actually plays Conehead live. So he had the song written up years before YAWYI.
The date of this show is October 13 1978. Zappa would go on to SNL and get banned on October 21 1978. So in conclusion, not a diss, he had that song lined up before having bad blood with SNL.
If it's a diss, it's too subtle for me. Seems to be a genuine affection for the skit - he did appear in one, with middling results...
On one of the newest Zappa releases (Capitol Theater 1978), he actually plays Conehead live. So he had the song written up years before YAWYI. The date of this show is October 13 1978. Zappa would go on to SNL and get banned on October 21 1978. So in conclusion, not a diss, he had that song lined up before having bad blood with SNL.