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1.
The act of two people, male or female in any combination, rubbing their anus' together for the purpose of sexual gratification.
My wife makes me take a shower to remove my duck butter before long sessions of port holing.

After a long workout there is nothing quite as gratifying as the sweet surrender of port holing my best friend.
by blackpearl905 April 29, 2012
 
2.
Sexual postion on a ship. Like Doggy Style
"Bent her over in front of the port holes last night" "Great view, love port holing"
by Disney Friend November 06, 2012