According to an annual poll put out by Marist Polling, the most annoying word or phrase of the year (for a record fifth year in a row) was the word "whatever."  And I'm pretty sure every word in the top five was ALSO said in the movie “Clueless”.  Here they are.

1.  "Whatever" . . . 38% of us find it annoying, compared to 32% last year.

2.  "Like" . . . 22%.

3.  "You know" . . . 18%.

4.  "Just sayin'" . . . 14%.

5.  "Obviously" . . . which annoys 6% of people, and was the only NEW phrase to make the list this year.  (Last year, number five was "Twitterverse".)