This is the 2349th most frequent German word.
lars
"Lars" is not a German word; it is a given name.
Here, 'Lars' is used as a proper noun, denoting the name of an individual.
Lars ist mein bester Freund.
Lars is my best friend.
Here, 'lars' is used metaphorically as a slang term, indicating something unconventional or unexpected.
Ihm ist der Gedanke ganz lars.
To him, the thought is quite bizarre.
Again, 'Lars' is a proper noun referring to a specific person named Lars.