One who gives up membership in or withdraws support from a political party. ... A person who withdraws from a political party, group, etc.

What does bolter mean in slang?

b : a person who ends his or her affiliation with a political party.

What does Booter mean?

In the world of IT security, a booter is a type of service that delivers distributed denial of service (DDoS) attacks for customers. It is a frightening part of the black hat world of cyber warfare that security professionals are concerned about.