I saw this word in a chat room in 2003. There it meant a stealthing chatter secretly carrying out the agenda of another- and generally easily recognized- chatter. I believe in the larger sense it has come to mean a person or figurehead who speaks under the direction of another...as though a child's sock toy with someone's armed jammed up their ass.
Why bother listening to Jack? He's like totally Natalie's butt-puppet.
3. Also relating to the way a sock puppet is filled and then controlled from the bottom: A man in prison being filled from the bottom at the delight of many for hideous crimes he was convicted of.
Did you hear? Charles ____ was convicted of molesting 12 children and is sentenced to 38 years. I'll bet San Quentin can't wait to unwrap their brand spanking new "Butt-Puppet!" Merry Christmas San Quentin!