When you say that someone is the 'New Kid on the Block' you mean that they are a new arrival to the area or to the social group.
Example of use: “Jeff’s the new kid on the block; he doesn’t know all the rules yet.”
Interesting fact about New Kid on the Block
The phrase 'new kid on the block' originated in the United States and was first seen in print in a “Skippy “ cartoon by Percy Crosby: “The new kid on the block told me that the next time he saw you he was goin’ to twist your nose.”
