Liar is the entity that founded the first dominant Religion1)2) of Improbable Island by building the Cybercity Shrine. Very little else is known about him. If he would like to elaborate on this, it would be helpful.
Some would consider it unwise to put too much trust in the words of someone called 'Liar' in a place called 'Wiki of Lies'3)4)
A liar5) is also a musical instrument, which is a bit like a guitar. It is usually made from wood and hamstrings, and was very popular in medival times, as I'm sure most of you will remember.