Sam: Last night we found this really awesome restaurant for authentic southern BBQ!
Tony: Really? Where is it?
Sam: It's a tiny little hole in the wall right on the corner of Main St. and First. The food is cheap and delicious!
Jenny: So, how was your trip to San Diego?
Sara: It was great! We found this little hole in the wall downtown that had the best Mexican food I've ever had.
Jenny: Wow! That sounds good!
Meaning: In American English, the term hole in the wall is used to describe a small restaurant that is usually cheap and delicious, but sometimes a little dirty looking. It sometimes can mean that the place is a little dirty looking but with good food or a cozy atmosphere.