Under the Cheese Posted in U Best definition Under the Cheesedrugs Under the influence of a mind-alterning drug (usually shrooms); high; acting strangely. Dude, I was so far under the cheese last night I thought my bed was trying to eat me! How satisfied are you with the definition? Looking for Under the Cheese meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 42 times.