First mentioned in the Bass Millionaire song, "Smokin' Indians," spider head means when one receives oral sex from eight different partners at the same time.
Any follower of Islam or a terrorist, or diplomat or ruler of a predominantly Muslim country. Ayatollahs and Muzzins are also known as the 'term'. A very derogatory term for the above. i first heard it in the early 70's.
The religious rulers of Iran are just a bunch of Laundry Heads..