When someone comes up from behind you and puts their armsaround you as to hug you and then adds a pelvic thrust into your lower region.
We were in the garage and thought nobody was looking so I surprised my wife with a humphug...unfortunately our son caught us and asked what we were doing.
When you aproach someone in order to give them a friendly hug, and that person (hopefully of the opposite sex) practically sits on your lap. Commonly found in desperatepeople.
"hey you know that lisa chick? yeah, i hugged her and she gave me the time of my life! what a hump hugger."
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.