grainer
A closed hopper car on a freight train. Called a grainer because they normally haul grain. This is old hobo slang.
I hopped a grainer on that train
Grainer
To put your dick in someone’s drink while they’re not looking, a technique invented by French Canadian singer Kevin Parent.
“My drink has a little something...”
Kevin: “I call that Grainer”
Kevin: “I call that Grainer”