Slang, possibly from the end of World War II, but it was certainly used by the US Army during the Vietnam War. It means a heavy or awkward load in adverse or difficult circumstances.
When they first heard it, the expression “humpin’ the pig” the word humpin' caused a certain amount of consternation among reporters (see humping). The pig in question was not a pink bacon producer or an officer of the law but nickname for the M60 machine gun, so the grunt they were interviewing would have been a machine gunner.
In World of Warcraft, in arena matches, to use pillars or other terrain to obstruct line of sight, thus restricting ranged attacks. This often results in long games or a defensive stalemate.
I hate fighting 2 v 2 against a pillar humpingdruid. Those games can last an hour.
Rubbing your crotch against something for stimulated arousal and oral pleasure. Examples include humping your bed, the couch, the floor, pillow humping, and especially humping the body of another person.
He started humping her to prepare his libido for their big intimate sessiontogether!