Are you currently defending yourself in the defamation lawsuit? If not, what does your lawyer or public defender think? What city and state do you reside in?
If you are thinking about bankruptcy, I would contact a bankruptcy lawyer near you asap and ask them this question. The exemptions of what you can keep during chatper 7 varies state by state. I did find this on the US Governement Bankruptcy website (but definitely call a bankruptcy lawyer)

Filing a petition under chapter 7 “automatically stays” (stops) most collection actions against the debtor or the debtor’s property. 11 U.S.C. § 362. But filing the petition does not stay certain types of actions listed under 11 U.S.C. § 362(b), and the stay may be effective only for a short time in some situations. The stay arises by operation of law and requires no judicial action. As long as the stay is in effect, creditors generally may not initiate or continue lawsuits, wage garnishments, or even telephone calls demanding payments. The bankruptcy clerk gives notice of the bankruptcy case to all creditors whose names and addresses are provided by the debtor.

There was a list of debts that cannot be discharged by Chapter 7. Defamation was not listed. Here are the charges that can be discharged:
Debts not discharged include debts for alimony and child support, certain taxes, debts for certain educational benefit overpayments or loans made or guaranteed by a governmental unit, debts for willful and malicious injury by the debtor to another entity or to the property of another entity, debts for death or personal injury caused by the debtor’s operation of a motor vehicle while the debtor was intoxicated from alcohol or other substances, and debts for certain criminal restitution orders.11 U.S.C. § 523(a). The debtor will continue to be liable for these types of debts to the extent that they are not paid in the chapter 7 case. Debts for money or property obtained by false pretenses, debts for fraud or defalcation while acting in a fiduciary capacity, and debts for willful and malicious injury by the debtor to another entity or to the property of another entity will be discharged unless a creditor timely files and prevails in an action to have such debts declared nondischargeable. 11 U.S.C. § 523(c); Fed. R. Bankr. P. 4007(c).