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1.
n. (metaphorical, yet, often simultaneously literal) one who habitually and effortlessly utters falsehoods in a most blatant and profane manner, all the while maintaining a lackadaisical appearance of ingenuousness; despite, or perhaps, due to the fact that their entire corporeal membrane is filled to bursting with an inexhaustible supply of foul, though nitrogen-rich fecal mendacities waiting to be excreted into their victims' ears
I can't believe you'd give any credence to anything that lying sack of shit says!

(insert name of any living politician or other person who wants something from you here) is a lying sack of shit!
by GM July 21, 2003
 
2.
An awful, unreasonable, pathological liar. Often a self-obsessed deluted personality.
Ian Halperin is a lying sack of shit.
by Puff666420 January 25, 2012
 
3.
A person that lies about everything
Doug is a lying sack of shit
by Ol Dirt Dog May 11, 2010