What are eyeboogers made of?

The correct term for eyeboogers is rheum.

Eye boogers are made of mucus, oil, dead skin cells, dust and other debris that collect on the surface of the eye. Mucus is a thick, sticky fluid produced by the mucous membranes that line the eye and helps keep the eye moist and free of infection. The oil comes from the meibomian glands, which are small glands located on the edge of the eyelid that secrete an oily substance that helps keep the tears from evaporating too quickly. Dead skin cells and other debris can also get caught in the mucus and oil, and can eventually form into a crusty booger.