I discovered this group a little while ago, and I really love them (specially the last album, "snacktime"). I highly recommend you listen to them. 

I couldn't find the lyrics for this song anywhere in the whole internet... so I typed them myself.

The only sentence I don't understand is the sixth one in the first paragraph (marked with "??"). If you can understand it, please leave a comment =)

Thanks to Sebastian Canevari for the help!

Barenaked Ladies - A word for that
Snacktime

There's a word for that
but I don't seem to know it
sometimes I grow a moustache
just so I don't have to show it
The word for that
that someone somewhere chose
for that little dented skin
between my upper lip and nose

There's a word for that
What does it start with?
The word for that
I'd sound so smart if I only knew
The word for that
Perhaps you do

The word you're looking for is philtrum

There's a word for that
it may come to me soon
it dangles down in my mouth
and is often in cartoons
The word for that
it seems like such a drag
to not know what to call that little fleshy punching bag

There's a word for that
What does it start with?
The word for that
I'd sound so smart if I only knew
The word for that
Perhaps you do

D'you mean uvula?

There's a word for that
it's on the tip of my tongue
well, actually underneath it
and has been since I was young
The word for that
although i wouldn't quote
it likely stops my tongue from dissapearing down my throat

There's a word for that
What does it start with?
The word for that
I'd sound so smart if I only knew
The word for that
Perhaps you do

What does it start with?
The word for that
I'd sound so smart if I only knew
The word for that
Perhaps you do

Oy, you nuts, it's frenulum