Mani/Pedi

Mani/Pedi. The people who say this instead of manicure/pedicure probably like Sex & the City. I think that's reason enough to hate it.

Vacay

Vacay. An annoyingly shortened version of the word vacation. Because that one extra syllable is just a little too difficult to bother with.

I don't think it's a coincidence that Perez Hilton was #3 (and 4) in the Google search results for this word.