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1.
To engage in vigorous sexual activity, specifically with a woman that you do not care about. Usually used by drunken rednecks.
I got drunk and boar hogged the shit out of Sally last night.

(As an attractive woman walks by)
"I'd like to boar hog her."
by Dutch Dalton May 04, 2008
 
2.
Anal sex upon a restrained victim or subject.
Let's go back to the stationhouse and boarhog us a drunk.
by westgateian September 09, 2003