Lyric discussion by partypunk101 

Cover art for La La Lie lyrics by Jack's Mannequin

the "la la lie" part is definitely not just a "jingle" or backup vocals... if it was that insignificant, andrew would not have named the song after it. hell, he would have just said "la la la" instead.

i agree with gaylordmfocker... i think he means that his friends are helping him pull through by lying and telling him what they think he needs to hear.