Firstly, no, I did not make that word up.
Secondly, yes, it is actually a real word that has a real meaning.
Throttlebottom is a name given to a dishonest public official.
The word became popular around the 1930s after a character (Adam Throttlebottom) from the play Of Thee I Sing.
People say that Mayor Quimby of Springfield is a real throttlebottom.
His actions regarding the murder showed use he was a throttlebottom.