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1.
One who will do anything to be anally penetrated---repeatedly.
Joshua's ankles are filled with helium, as he's such a pig bottom. One look and he's flat on his back for hours.
by Guillermo August 25, 2003
 
2.
A person that enjoys being anally penetrated by as many people as possible. They like it dirty and don't care how they get it or who they are getting it from.
Russell is always out carousing, he is such a pig bottom always looking for multiple guys to gang bang him
by Blowing Bubbles September 24, 2008
 
3.
In BDSM, 'bottom' typically refers to the individual who is the recipient of the actions of the top or dominant. Pig meaning 'greedy as a pig'
She's a dirty pig bottom, she just loves dirty sex and lots of it.
by bellaluva June 11, 2009