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1.Katy Perry, "California Gurls"
So. Many. Questions. Why is Snoop wearing a pink cupcake-print suit? What happened to his gummy-bear army? Why does he even have a gummy-bear army? Did Katy Perry force him to do these ridiculous things? (My, how the mighty fall.) Why is a song about California set in Candy Land? Why does she shoot whipped topping out of her bra? The music video for "California Gurls," the so-called 2010 song of the summer, is just the icing on the cake of this terrible tune. Word of advice for Ms. Perry: if you're going to follow up a classic song like the Beach Boys' "California Girls" with a version of your own, make sure it doesn't suck.
2. Summer Girls - LFO
3. Hot In Herre - Nelly
4. Summer of 69 - Bryan Adams
5. I Gotta Feeling - BEP
6. London Bridge - Fergie
7. Graduation - Summer C
8. My Sharona - The Knack
9. All I Wanna Do - Sheryl Crow
10. Birthday Sex - Jeremiah
credit : http://newsfeed.time.com/2010/07/19/top-10-worst-songs-of-the-summer/picture-6-10/