Generally all the songs of A R Rahman are nice to listen. But, there are some movies songs that did not do well.
Shabba shabba hai rabba from the movie Daud.
Mere dil me song from the movie Kabhi na kabhi which features actress Pooja butt.
Lucky lucky song from the tamil movie Ratchagan which is totally funny.
Hindi format of Yaaro yarodi song of Alaipayuthey definitely a disaster.
Last place goes to all tamil songs which were dubbed in hindi.