Since 2017, the massive phenomenon of the viral video "Labrak Pelakor" has been discovered on Indonesian social media. These videos contain fights between women who are vulnerable to verbal and physical violence. “Labrak Pelakor” is known as a marriage conflict that occurs due to infidelity. Pelakor is a variety of conversation created by Indonesian netizens from the acronym Perebut Laki Orang, which means women who tempt and seize someone's husband or a woman who is having an affair with someone's husband. “Labrak Pelakor” are incidents that are documented and uploaded on social media. The observations show that the speech used in this accident contains language crimes. Language crime is a criminal act that aims to injure, attack, and psychologically harm the victim. The impact of this event can kill the character, damage reputation, attack honor, embarrass, create public trouble, propaganda, false information, and threats. The objective of the study is to investigate and find linguistic evidence of insulting. The study uses a forensic linguistic approach. Forensic linguistics is a forensic science that applies linguistic theories to solve linguistic cases. Forensic linguistics is an approach to analyzing the linguistics aspect of a language case to find legal evidence. Language is legal evidence associated with efforts to determine the speaker or perpetrator and interpret the meaning/intent of a spoken text. The aim is to ensure that the meaning, intent, and form of legal object texts indicating violations of the law will become clear. The legal evidence in the "Labrak Pelakor" is limited to determining the speaker or perpetrator only. The linguistic theory used to reveal the perpetrators is lexicogrammatical. Lexicogrammatics analysis consists of the clause system, transitivity system, and information structure that reveal the speaker's intentions, actions, and point of view. This study used a descriptive qualitative method. The data source is three viral videos entitled "Labrak Pelakor" with more than 600 thousand viewers on the Indonesian YouTube channel. Data collection techniques use observation and recording documents. Data analysis uses content analysis techniques. The linguistic evidence found that 60 utterances contained insulting spoken by 7 speakers. The result analysis of speakers' intentions, actions, and points of view proves their utterances are to insult their interlocutor.