fa la
noun
fä-ˈlä 
: a 16th and 17th century part-song
Example Sentences
Recent Examples on the Web If that won’t do, venture outside for some fa la la la laaaaas. 
Essence, 18 Nov. 2021 Society's rule for celebrating Christmas is that you're allowed to break out your fa la la's and start decking the halls once Thanksgiving has officially ended—but where's the fun in that? Elizabeth Gulino, House Beautiful, 28 Aug. 2019
Essence, 18 Nov. 2021 Society's rule for celebrating Christmas is that you're allowed to break out your fa la la's and start decking the halls once Thanksgiving has officially ended—but where's the fun in that? Elizabeth Gulino, House Beautiful, 28 Aug. 2019 Word History
Etymology
fa-la, meaningless syllables often occurring in its refrain
First Known Use
1597, in the meaning defined above