Where one being wraps their arms around the body of another being and holds them close for a moment. The psycho-physical message is along the lines of: "It's okay, I've got you"

Is mostly non-sexual, unless you go for a grope halfway through it ;)

Not strictly limited to humans, hugging can be done by other species, replacing arms with wings, tentacles, hooves, etc....

A term used to reference cannabis/marijuana/weed.

Hugging something is the act of hogging it. If you keep something for too long, and other people want it, your hugging it