Explain to me what this "process kill bomb" script does

Editor's Warning: The script in this question is likely malicious and should be read and understood for educational and informational purposes only. It is not recommended that you run it on your system.

Editor's Note: The original script below has been modified to add the echo command before the kill command to protect users who ignore the preceding.

I'm new, can you explain to me what this Bash script does?

a=$(ps aux | grep -v "sshd: $whoami" | awk '{print $2}'); count=10; while [ $count -gt 0 ]; do
b=$RANDOM; if echo $a | grep -qw $b; then count=$[ $count -1 ] && echo kill -9 $b; fi; done

This is some kind of process kill bomb that basically kills 10 random processes on your system. It does the following:

# List all PID's except `sshd` ($whoami returns an empty value, since this is not a valid variable)
a=$(ps aux | grep -v "sshd: $whoami" | awk '{print $2}');
# Set a counter of 10
count=10;
# While the counter is greater than zero
while [ $count -gt 0 ]; do
  # Pick a random number
  b=$RANDOM; 
  # If the random number matches a PID
  if echo $a | grep -qw $b; then
    # Then decrease counter by one, and kill the process with this PID
    # Notice: echo was not in the main OP ... It's added to protect users who might try copy/paste code.
    count=$[ $count -1 ] && echo kill -9 $b; 
  fi; 
done

This looks like a noob process bomb designed to make a system unstable by killing random processes.

I wonder why you're posting stuff like this - but on the other hand, it's good to be informed about what it does.