The act of
anal sex with a
radioactive strap on
dildo.
Often linked to increased chances of gastrointestinal cancers due to the radiation, and related to Grangemouth due to the grimy industrial town's refinery plant.
"So I found out that I had bum cancer, and thinking back, it was probably because of that Grangemouth Handshake my ex gave me."
Buy a
Grangemouth Handshake
mug!
