When someone has taken too much of a drug Ghb and it makes them sleep (go on concious)
They normally go in and out of consciousness and its this that is them going into a g hole. Probably derived from K hole.
A Vancouver, BC term based on GHB holing --but it refers to being tired, dishevelled, unproductive, feeling malaise, or being distraut. It can refer to low quality in general.
"Sorry I can't come to the show... I'm too G Holed"
Having ingested enough GHB to put one in a trance-like, semi-aquatic state of disillusioned unresponsiveness as if one had fallen into a hole and could not get out.
Johnny had fed the hooker so much G that she was fishing out on the floor, deep inside a G-hole.