Someone with a huge ego that should not have one; someone who brags at being good at something when their terrible at it. Also this person lies a lot.
Tom said that he was great at skateboarding, but when i asked him to go down the ramp, he fell and broke one of the wheels of his board; he is such a plonk!
by Tizzzy May 26, 2008
by tizzzy April 15, 2008