Plong 

placing your balls above the waist of trousers but beneath your tshirt, and then lifting up your tshirt to reveal your balls to random strangers whilst shouting "plong"

Hey Chris! What? PLONG! Dude put your balls away!

Plong by Harrrrryyy06 August 22, 2010

plong 

An unsual noise created by a elephant trapped in a jam jar.

"Can you hear that plong!"

plong by Felix_T May 14, 2008

Plong 

A term used to describe a person who's diet consists solely of Take Aways

"Man your such a plong!"

Plong by Neal Clarke May 14, 2008

Plong 

A racist or sexist lie

“She still hasn’t found the plong I made yet.”

Plong by 5mucks November 18, 2019

Plong 

A penis that is enormourmous in size. New defintion of slong since 2020

Hey dude, did you see Nabils slong?
Man, i saw his p. Its long. I wish I had his plong.

Plong by Yan man June 18, 2021

Plong 

A bunch of dumb fucking arrogant teachers that think they know shit this was defined in a never ending phone call.

Most teachers in schools are plongs

Plong by Im99%Black February 2, 2023

Plong 

When you take a poo and it is very long

That poo was so plong

Plong by LukeWarmMop September 9, 2023