Grrr

Part of speech: interjection

Definitions

1. A low growling sound made to express irritation, annoyance or exasperation with someone or something
2. An exclamation of vexation or fury, typically voiced as a guttural snarl of frustration
3. A throaty, rumbling noise of displeasure, used to signal that one is angered or irritated

Etymology: "Grrr" is an onomatopoeic interjection: it imitates the low growl of an animal or the sound a person makes when frustrated or annoyed. It is an elongated form of "grr", so the extra letters add length and emphasis to a sound that was already built on the same rumbling consonants. The word needs no borrowing from another language to explain it, since its spelling is simply an attempt to write down a noise that people recognised before they had any word for it.