Findings:

• Argh!
• arghh (user)
• gr (user)
• G.R. Emlin
• GR SUPER SAYIAN (user)
• GRS
• g+r (user)
• Helan går
• grr (user)

If you Log in you could create a "Grrr. Argh." node. If you don't already have an account, you can register here.