A sexual act similar to the popular "stranger" but involving a second person. A friend/partner sits on one of their arms constricting the blood flow until the point where numbness occurs and feeling is lost in that arm. The person with the numb arm then performs a hand job on the friend/partner.
"Phew all those GhostDads we gave each other on the secret trip really cut the tension but boy does my arm hurt!"
"The Jonas brothers are a horrible band but I hear they can be quite a bit of fun on the road performing a few GhostDads on each other and the crew?"