"what does mean when I have xxxxxxxxx total output drops"
It means, for xxxxxxxxx number of packets that should have been transmitted, they were not, they were discarded/dropped for various reasons. What are the reasons? They vary. Often it's some form of resource exhaustion, like overflowing an egress queue, but might be other causes, like a policer that's is limiting traffic to some rate below the interface's capacity. From what you've posted, alone, cannot tell more.
A related question is, are the drops, especially those shown in your posting "bad"? Again, insufficient information to say.
In general, drops if they occur, are often due to oversubscription of bandwidth, for such cases, they might be "normal", and for many protocols, provide feedback to the protocol to regulate its transmission rate (e.g. TCP).
Although it's unexpected, zero drops isn't necessarily a "good" thing, just as any drops isn't necessarily a "bad" thing,
