Some of the phrases on this thread are actual phrases though, they're not corporate speak.
"Can't see the wood for the trees", for example. Not corpoarte speak.
"Can you action this?", however, is very much corporate speak, and it instantly makes me lose faith in the capabilities of the person speaking.
The best managers and senior colleagues I've had have always spoken like normal people. They're competent, hardworking, knowledgeable and approachable.
I've worked with two people who particularly sound like they've swallowed a corporate dictionary. Both managers who were much less effective than their plain talking peers.
One had to say some words about a lovely member of staff who sadly died far too young. They gave the coldest, most impersonal tribute they possibly could have. It felt completely inappropriate.
It always strikes me as a replacement for actual competence. It doesn't instill confidence that they hold their position through their own natural talents - merely that they are acting their role, and the corporate speak is their script.
Interesting that many in here say it's a man thing. In my experience, the worst culprits with this have been women. Although I accept I'm lucky in that these people have been few and far between.