A cultivated “headspace” that some folks keep going for themselves usually because of their increasing difficulties coping with their Earthly status quo.
She was a good person but she was characterologically weak and therefore needed an altered state of consciousness, a parallel world she called “Rabbit Planet” which she created as an unguent to existence which for her had become both continuously tragic and annoying.
When while a female is licking you balls and you yell "Get that rabbit", it is an instruction for them to stick there tongue up your ass looking for the wascally wabbit. She won't find that rabbit but it will bring you much pleasure.
"Last Night when I told Daisy to get that rabbit, she got that rabbit, she stuck her tongue so far up my ass i blew a load"