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"Narf" is the best curse word substitute I know. When said with the proper tone of voice and harsh quality behind it, it can come across as both angred and annoied but it is versitial as it can also convey sarcasm or hummor.
Macradon
Human Reproduction Rod
You know, the good ol' slang.
"Damn, you're really annoying you stupid human reproduction rod"
Wolf_of_Darkness
Precisely!