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 PoooosEclaay December 29, 2021

`hey jim` `hey bob, guess what i did last night` `what?!` `i got plinkety-plonked` `wow, that must have felt good`
by plonker the donker September 15, 2017

The unusual sexual act of inserting Alker Seltzer up your rectum, followed by a quick hand shandy, and the imminent eruption of Jizz. See also Fizzing.
Pauls conventional Sunday afternoon hand shandy in front of the telly was taking a lot longer than usual so to speed him up he changed tact and decided on a Plink Plonk Jizz
by Lady Grey May 20, 2004

to drown a fat person
"hey billy, check out that swimming fat person."
"Hey, it'll be really fun to plonk za pony."
"yeah!"
"Hey, it'll be really fun to plonk za pony."
"yeah!"
by debkat August 17, 2003

by personwhowritesdefiontions October 8, 2021

Inspired by the 'planking' craze, the art of plonking is to lay a turd horizontally across the ground any objects outside of Plonk! wine bar.
by golden cobra July 13, 2011
