Vadge
A vadge is a term used to describe those who take pleasure from the unhappiness of others. If they suspect that someone may be enjoying themselves they will go to extreme lengths to cause unhappiness. Due to their frequent repeated use of the same phrase they are often mistaken as the son of a Plastic John, however a genetic investigation has showed that vadges are not 100% human, but the results of failed test tube experiments.
If left unattended may form SMEGMA,
A toxic fungus.
I was feeling rather happy but I've been vadged and now I feel like [Bleeeeep!].

It looks like a vadge, smells like a vadge and sounds like a vadge, luckily I didn't step in it!