Have you tried looking up the word 'metaphor' in this dictionary of yours?
I just did! It says...
The Dictionary said:Metaphor: a figure of speech in which a term or phrase is applied to something to which it is not literally applicable in order to suggest a resemblance, as in “A mighty fortress is our God.”
So choking the chicken, flogging the dolphin, tiptoeing over tulips, and rubbing the little man in the boat are various metaphors for masturbation! HOLY CRAP!
This is why I like Macrumors. I learn things here.