Sentence:  "Hello world, I'm a big-breasted vixen/ Come on, get <WSD>yiffy</WSD>!/ A whole lot of spooge is what we'll be seein'/ We'll make you <WSD>yiffy</WSD>!"/  &mdash; [http://groups-beta.google.com/group/alt.fan.furry/msg/34b7f78f0b4ec511] 
Meaning of the word marked with <WSD> tags:  Sexually aroused