Sorry if this is a dupe, but I didn't see it all in one place:
Since hitting 10K rep, I've been actively reviewing flags, and my disputed flag count jumped from 0 to 15 in a few days. It occurs to me that this site may have a different culture from the other sites on SE I've been active on. I know that some of the invalid flags flags generate an automatic disputed flag tag, but I want to make certain that I'm on the same page as everyone here.
Can we review the definition of Not An Answer, Very Low Quality, and SPAM flags?
Not An Answer: This answer does not make any attempt to actually answer the question. It should not be a statement of the answer's quality, per se. For example, a wrong answer should not be tagged with this flag. But, rather an answer that is just completely off the topic of the OP's question.
For Example: Q: Which form to the verb to be is correct in this sentence? I __ a good man.
A: Verbs often take different forms in English. I usually use a different verb in each sentence. --- Not An Answer
A: I is a good man is the correct form. --- Should be down voted or commented upon. NOT FLAGGED.
Very Low Quality: This answer contains enough quality issues that it is completely invalid. The answerer's grammar, punctuation, and spelling have made the answer unintelligible. (It is highly unlikely to be of benefit after editing.) Or it is just a link with no explanation of the link or its meaning.
Using the same example above:
A: i ujuly uses a word at a place ant i duznt no wich wun. --- Very Low Quality
A: I use am here. --- Not VERY LOW QUALITY, just a bit succinct. Should be handled in comments and votes.
SPAM: Basically any post that is not even a remote attempt to answer or further the purposes of the site. This can include actual spammy links to websites, services, etc. But, it can also be things like "I like toast."
I know some disagree with the last one, but it is spam, just not advertising spam. Matt points out below these can also be flagged as offensive. That seems reasonable, too.