What is known as a SLAPP?

^1. "SLAPP" is an acronym for "strategic lawsuit against public participation." (Equilon Enterprises v. Consumer Cause, Inc. (2002) 29 Cal.4th 53, 57, fn. 1 (Equilon).) "A SLAPP . . . seeks to chill or punish a party's exercise of constitutional rights to free speech and to petition the government for redress of grievances." (Rusheen v. Cohen (2006) 37 Cal.4th 1048, 1055 (Rusheen).)