In far Tibet
There lives a lama.
He got no papa,
Got no mama.
He got no wife,
He got no chillun.
Got no use
For penicillun.
He got no soap,
He got no opera.
He don't know Irium
From copra.
He got no songs,
He got no banter.

 Wikipedia  explains: 
 [The toothpaste Pepsodent] was advertised for its purported properties fighting tooth decay, attributed in advertisements to the supposed ingredient Irium. Irium is another word for sodium lauryl sulfate, an inexpensive ionic surfactant. However, in a 1994 speech, then-FCC chairman Reed Hundt claimed that the “Irium” mentioned in Pepsodent advertisements “didn’t exist.”
I Will Arise and Go Now