arf

Short definition from Wiktionary

Interjection

1. 1
   Synonym of woof (“sound of a dog's bark”).
2. 2
   Synonym of woof (“expressing strong physical attraction”).

Noun

1. 1
   Initialism of acute renal failure.
2. 2
   Initialism of analog radio frequency.

Proper noun

1. 1
   Initialism of Armenian Revolutionary Federation.

Phrase

1. 1
   "Abort, Retry, Fail?"