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1.
Man who will fuck any girl, regardless of how fat and ugly she is
Oh man, that guy is a total pigrooter, did you see the fatty he did last night?
by Phil Bailey April 13, 2005
 
2.
adj.Aust.colloq.1:To have sex with an unattractive person. Derived from the colloquial use of the words pig meaning unatttractive, and root meaning fornication.
2: To have sex like a pig in a jerky motion while grunting loudly.
See above definitions
by Fish January 06, 2005