lillibullero

from The Century Dictionary.

• noun Originally, it is said, a watchword of the Irish Roman Catholics in their massacre of the Protestants in 1641; afterward, the name of a song burlesquing the former, said to have been written by Lord Wharton, which was extremely popular in England during and after the revolution of 1688, having the refrain “Lero, lero, lilli burlero,” etc.