Slang
Pissant is an epithet for an inconsequential, irrelevant, or worthless person, especially one who is irritating or contemptible out of proportion to his or her significance. A Virginia politician who also popularized the term once silenced a heckler by saying "I'm a big dog on a big hunt and I don't have time for a piss-ant on a melon stalk."[9]
The term piss-ant can also be used as an adjective, usually as a pejorative, to mean insignificant and annoying.
I have NO idea why this comes to mind...