Meaning
Sextortion is a form of blackmail in which the attacker threatens to send sexual images or videos of you to others if you do not pay them or give them additional sexual content. This sextortion definition applies to any gender, and although attacks can be directed at anyone of any age, attackers tend to target younger individuals.
Source
https://www.fortinet.com/resources/cyberglossary/sextortion#
Further Reading:
Sextortion: Cybersecurity, teenagers, and remote sexual assault