Wikipedia:Wall of text
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A wall of text is an excessively long post to a noticeboard or talk page discussion.
Some walls of text are intentionally disruptive, such as when an editor attempts to overwhelm a discussion with a mass of irrelevant kilobytes. Other walls are due to lack of awareness of good practices, such as when an editor tries to cram every one of their cogent points into a single comprehensive response that is roughly the length of a short novel. Not all long posts are walls of text, some can be nuanced and thoughtful. Just remember: the longer it is, the less of it people will read.
The Chunk O' Text Defense is an alleged wikilawyering strategy whereby an editor accused of wrongdoing defends their actions with a giant chunk of text that contains so many diffs, assertions, examples, and allegations as to be virtually unanswerable.
How to survive a wall of text
Read surrounding posts, skim to determine whether the long post is largely substantive or mostly irrelevant. If it is the latter, apply trout and other remedies in suitable proportion.