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1.
A response to something that is really unfunny.
Alan: I fucked your mum last night hahahaha.
James: ...arf arf.
by Kempo August 26, 2006
 
2.
When you have just raped, destroyed, dissed, BxR'd or had multiple counts of unprotected sex, this is your war cry afterwards.
Damn Rob just got BxR'd, ARF ARF ARF.
by asexybum November 08, 2007