What does grrrrr mean?

Answer 1

Grrrrr, GRRRR, grrr etc. often signifies an expression of strong sexual attraction to someone... It can also mean playful anger or frustration, depending on context. But recently it is more often used to reflect lustful desire in slang terms when chatting casually in places like social forums or in texting. Basically an onomatopoetic word, which imitates an animalistic sound that a dog or wolf makes. (posted 2012)

Answer 2

"Grrrrr" is an onomatopoeic word often used to represent a growling sound made by animals or to express frustration or anger in a playful manner.