Black Eyed Peas 'My Humps'. I was going to pick out a particular lyric which was garbage but it's all garbage.
The second contender is possibly a controversial one.
From a song which is terrible titled
'Ride the snake, ride the snake
To the lake, the ancient lake, baby
The snake is long, seven miles
Ride the snake...he's old, and his skin is cold'
'The west is the best
The west is the best
Get here, and we'll do the rest'
These lyrics are so bad, whoever wrote them and the band will be forgotten about as they were so terrible.... Nope, they were Jim Morrison/The Doors who many years on are still well known (which I don't think many of the other contenders in this thread will be...)