Matthew McConaughey stars with Snoop Dogg in the upcoming movie The Beach Bum.

Snoop plays McConaughey's weed dealer in the film. During the shooting, Snoop also played a smokey prank on the Oscar winner.

On Jimmy Kimmel last night, McConaughey explained how Snoop "snooped" him.

"My snooping happened, it was a scene I was going to Snoop. I got writer's block and Snoop has the magic weed. I go to the prop man, and make sure I got prop weed. And prop weed is not real weed, it's like crushed oregano. We get to the six-minute scene. Pass back and forth. All the sudden at the end he goes ... 'that ain't prop weed. That's Snoop weed' ... The next nine hours were a lot of fun.  But I don't believe we used one word in the English language.