So many of us have dropped the F-bomb, that "F-bomb" is now a real word.

You'll find it in the newest edition of the Merriam-Webster Collegiate Dictionary, along with such words as sexting, obesogenic and life coach.

Once a year, the editors at Merriam-Webster review our use of language, collecting evidence of the usage of new words. They do this by reading newspapers, magazines and even studying the labels on beer bottles and boxes of frozen food.

So where did the word "F-bomb" originate? According to Merriam-Webster associate editor Kory Stamper, it was traced originally to a 1988 Newsday story about Mets catcher Gary Carter. The now-deceased baseball player said he was giving up F-bombs, along with other profanities. However, it wasn't until the late 1990s that the word really took off, thanks to a locker room tirade by college basketball coach Bobby Knight.

"It's a word that is very visually evocative. It's not just the F-word. It's F-bomb. You know that it's going to cause a lot of consternation and possible damage," Stamper told The Associated Press.

Here are 15 of the new words added to the Merriam-Webster Collegiate Dictionary:

1. Aha moment: a moment of sudden realization, inspiration, insight, recognition, or comprehension

2. Copernicium: a short-lived, artificially produced radioactive element that has 112 protons and is the most recent addition to the Periodic Table of Elements

3. E-reader: a handheld electronic device designed to be used for reading e-books and similar material

4. Earworm: a song or melody that keeps repeating in one's mind

5. F-bomb: the profanity f***, used metaphorically as a euphemism

6. Flexitarian: one whose normally meatless diet occasionally includes meat or fish

7. Game changer: a newly introduced element or factor that changes an existing situation or activity in a significant way

8. Gastropub: a pub, bar, or tavern that offers meals of high quality

9. Life coach: an advisor who helps people make decisions, set and reach goals, or deal with problems

10. Obesogenic: promoting excessive weight gain; producing obesity, such as an obesogenic environment

11. Sexting: the sending of sexually explicit messages or images by cell phone

12. Shovel-ready: ready for the start of work

13. Systemic risk: the risk that the failure of one financial institution (as a bank) could cause other interconnected institutions to fail and harm the economy as a whole

14. Tipping point: the critical point in a situation, process, or system beyond which a significant and often unstoppable effect or change takes place

15. Underwater: having, relating to, or being a mortgage loan for which more is owed than the property securing the loan is worth

--From the Editors at Netscape