Pun on the word and dinosaur species Velociraptor well known for tearing apart its pray. Refers to a cat which has exhibited the same carnivorous tendencies by doing a full rendering of some luckless rabbit, bird or mouse.
Plural mogaraptors refers to cats rendering in packs.
Me: What's with the funny smell in the lounge and the bits of fur everywhere.
You: I think it used to be a rabbit before the mogaraptor got hold of it.