Some people like to exchange common words for unnecessarily technical jargon. For example,
Your friend: I partook in ornithological observation
You: You mean you went birdwatching?
Is there a word for what your friend here is doing?
That is, if you asked your friend to stop _______ing, you would be asking them to stop using convoluted wording for no reason.
EDIT: I'm not referring here to the amount of detail, only to the unnecessary substitution of jargon into an otherwise straightforward sentence.