A backward thinking genius. The term became famous through xltronic where one man from the Los Angeles underground blew peoples heads up with his infinite abilities.
Encroaching past the center of the bed and basically hogging all the space.
My granddaughter likes to sleep with grandma in her big king sized bed. I always tell her that she is encroaching on my side and she says she just wants to cuddle. Hence the new term "encuddlement".