What does it mean? What to do about it?
Table "turns" are the number of times per second that enough reads occur that all of the records in a table could be read.
Fix the code. There may be an indexing problem or a poor algorithm choice. You may also have an opportunity to cache the frequently accessed data in temp-table.
It is very common for tiny tables to be read incessantly. This churning activity can dominate resource contention and severely limit performance.
See also Finding code: Excessive reads.