✔ 最佳答案
A bug finder is a program that find bugs in certain programs or in your system
When they say Mac OS X is easy pickings for bug finders is say that Mac is easy to get infect by bugs since they claim to have the "best security" which is not true for now a day.
And in terms of answering your question
Here's a simple way to say it
It is a program that track, locate and delete bugs when the program or data is infected with bugs.