Hey guys, I wrote the following definition of thread crapping.
If it helps, you can use it without restriction or attribution, and can make any changes that you deem appropriate for your purposes:
thread crapping [thred krap•ing]
verb.
1. Thread crapping occurs when a person comes into a thread and posts something contrary to the spirit/intent of the thread, not for the purpose of offering a legitimate argument or counter-point, but merely for the purpose of derailing the discussion, or turning it into an argument, or for the purpose of insulting, abusing, or otherwise harassing one or more of the people who have posted a comment in the thread.
2. Thread crapping lacks serious literary, artistic, political, or scientific value. Thread crapping also lacks rational and reasonable argument based upon statistical, logical or even emotional appeal. The easiest thread crap to spot is that which involves some form of personal attack or insult, racism, sexism, homophobism, ageism, or other form of bigotry.
3. Any negative comment made in the “for sale” area of a forum. Negative comments that constitute thread crapping may be, but are not limited to, those comments made about the items listed for sale, and/ or any negative comments made regarding offers to buy, or counter-offers to sell, or any offer to trade that has been posted in the thread.
4. For moderators, thread crapping is like pornography in that you will know it when you see it.