I wonder if, perhaps, it has changed in its meaning (as the English language is wont to do) and where this change occurred. Here are some examples of it being used to mean going rapidly:
This is surely an odd question but the question stemmed from a conversation of conversion which, honestly, was an absurd question in the first place. The original question was, "How fast does a raped ape go and how many horsepower are in a raped ape."
Lacking an official answer I have postulated that 1 RA is equal to 350 HP because a 350 V8 powered automobile certainly goes like a raped ape. But, the origin of the phrase is still unknown and this is a mystery that must be solved.