A person who has two contradictory or incompatible roles; a double-dealer; a deceitful or hypocritical person.

A corrupt lawyer (or occasionally juror) who takes fees or bribes from both sides in a case.

A person who is able to use the right and left hands equally well; an ambidextrous person.

Double-dealing, deceitful, hypocritical; specifically (of a juror or lawyer) that corruptly takes fees or bribes from both sides in a legal case.