As an admin there is, on new accounts, a "Spamcleaner" option which deletes the account along with all it's posts. The question is whether you'd actually want your entire account deleted, and whether I could actually make the option work (it disappears after an account is a few weeks old).
There is an option "delete conversations", but never have used it my best guess is that it only deletes your posts in PMs, not posts in the rest of the forum. Why do you wan this anyway? Are there particular posts you're ashamed of?
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Comments on Profile Post by miniu