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1.
Incestous shippings (made usually by bronies or "cloppers") involving ponies from the Apple Family from My little Pony: Friendship is Magic.
Examples of applecest:

Big Mac x Applejack

Braeburn x Applejack

Braeburn x Big Mac
by yourFACE July 16, 2012
 
2.
When people who work at the Apple stores constantly hook up with one another.
I'm glad you don't work there anymore. No more apple-cest relationships.
by really? you need to know? June 04, 2010