For this year it's easily Sexyback and My Love. Ever? Um, I have to say it's the dreadful Just Lose It. That song is not even funny and it's basically recycled in a way from Without Me.
If you said anything by High School Musical, you are 120% correct!
TERRIBLE! One of the, if not the WORST High School portrayl in all cinema history and a total disgrace to everybody in our generation. (Both with the songs and the movie.)
I'd say "Ladies Night" by Ayumi Hamasaki. Other than that, perhaps some of those "one-hit wonder" rap singles that don't make sense and only include catchy lyrics and beats. Some examples include: "Laffy Taffy," "U & Dat," "Miss New Booty"...etc. Crazy Frog comes close too. Ooh, don't forget anything by Kevin Federline.
I'm Not A Girl, Not Yet A Woman by Britney Spears
London Bridge by Fergie
Confessions Of A Broken Heart by Lindsay Lohan
Candy Shop by 50 Cent
Rebelde by RBD