Here's a pretty obvious contender....

^I actually kinda like that one.

That Flobots song makes me want to get violent, though. First thing that came to mind.

When that song comes on at the bar, you know the evening has just "jumped the shark".

That Pussycat Dolls song/video is like everything that's wrong with America. I don't think I've ever seen anything so blatantly, unironically, proudly shallow in my life.

I'm going with either "I Kissed A Girl" or "UR So Gay"
ughhh

The PCD and Perry songs mentioned above, plus:

T-Pain/Wayne - Can't Believe It (the only thing worse than a T-Pain song is a plodding, meandering T-Pain song..)
Britney Spears - Womanizer (chorus ruins it if the froggy vocals in the verse didn't already ruin it)
Flo Rida f. T-Pain - Low (this ruled most of Q1 2008, so..)
Flo Rida f. will.i.am - In The Ayer (I didn't really think the collab between Flo Rida and T Pain could be any aggressively worse, but be had to go and bring will.i.am into it)
Flo Rida f. Timbaland - Elevator (probably the least terrible of the 3, but that's not saying much)
OneRepublic f. Timbaland - Apologize
Madonna f. Timberlake & Timberland - 4 Minutes (in which Madonna spends the 4 minutes she needs to save the world attempting to destroy it)
Wayne ft. T-Pain & Mack Maine - Got Money (the song was bad enough, but then they had to go and remove teh only enjoyable part of the song and replace it with a generic verse from a generic rapper)

Those are the ones that come to mind right now...

I really tried to like Womanizer. I think the verses are pretty cool but the chorus is just way to repetitive. Doesn't go anywhere. I feel like I've probably heard 20 songs involving T-Pain but they all seem to blur together to the point I can't even be bothered to look up song names. It's just like this vast, slow moving pastiche of pop-culture background noise.

http://www.thekillersmusic.com/ Meh. Meh. Meh.

I'll tell ya', don't know if Lil Wayne's Lollipop classifies for the worst but song sucks on the dance floor. I get requests for it at receptions and I try and explain that it doesn't work. Then they'll swear it will. I play it and the dance floor empties.

That sorry nonsense Kid Rock is responsible for.

Joke not funny.

Not a joke. Perhaps they have a decent current song that I have not heard (to be fair, I enjoy "All These Things That I've Done"), but I was referring to "Human" which was defaulting as the audio at the link, a sorry mess of triteness.

'Human' is a good song

'Spaceman' is a better song

You'll be changing your tune, soon, friend

John Mayer - Say
Linkin Park - Shadow of the Day
Soulja Boy - YAHHH
Def Leppard f/Tim McGraw - Nine Lives
Ashlee Simpson - Outta My head
Maroon 5 - Goodnight Goodnight

Well, I just gave "Spaceman" a good, serious listen. It's better than "Human", but not much better. (I was with it until he he repeats that spaceman/dreammaker/songmaker coda over and over...)

YES. My Worst Single nominee choice, back at the beginning of the year...

I...had no idea. The mind boggles.

So Bad It's Good Honorable Mention Award

Everlast "Folsom Prison Blues." Just heard this a few minutes ago. OH. Fuck. ME.

Crime Mob feat. Miss Aisha - Stilettos (Pumps)

Theory of a Dead Man- "Bad Girlfriend"

is this butt rock?

I feel like there could be hundreds of modern rock tracks I could list if I could only stomach listening to Q101 for more than five seconds at a time.

I just heard this for the first time this morning listening to that new Hood Internet mix. I was amazed with this song.

Indubitably