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A referation to a promiscious woman, with clear connotations to her genitals, saying that they are a hole that is for everyone. That goes around the block, and is often shared by several beings at given time.
Example 1: Your mum is such a felleshull.

Example 2: Du er et felleshull, Lillegull, du fikk et gangbangknull i ditt rompehull!
by Gullgutt April 26, 2011