The act of having two openings filled at once, mouth, anus or vigina. Usually done with three people but toys can be a replacement.
Daddy introduced this to me once in one of or sessions. He has used it on me twice now. He has an a device he uses that attaches to him and adds a dildo to his body... or double penetration for me. Its very enjoyable... but overwhelming at the same time. Its almost as if my body doesn't know what to focus on and it goes into overload. Both times put me into a coma! I'm not sure if I could handle something in my mouth at the same time as my vagina our anus...I would definitely not be giving pleasure from my mouth... it would be just awkward and uneventful! Lol