...It's kinda like that's what she said, except you use it for weed instead of sex jokes. for example.
*At a baseball game* and someone yells "Just hit it!" That's what Mary said!
Or
"Aw man, I made a mistake on this paper" "Just rip it dude," That's what Mary said
*On a roller coaster* "We're so high up dude!" that's what she said