Hard to say if this is the worst song or the best song ever....
... but my nomination would be:

"Where's me jumper?" by Sultans of Ping FC:

Dancing at the disco, bumper to bumber,
Wait a minute, where's me jumper ? ( x5 )

Oh no.
Dancing at the disco, go, go, go.
Dancing at the disco, oh no, oh no, oh no.
Dancing at the disco, go, go, go.
Dancing at the disco, oh no, oh no.
It's alright to say things can only get better,
You haven't lost your brand new sweater.
I know I had it on when I had my tea,
And I'm sure I had it on in the lavatory.
Oh no.

Full lyrics: ping.fishtank.org.uk/lyrics/jumper.php
( TooMuch2AM, Wed 3 Dec 2003, 1:25, Reply)