The lyric repeated at the beginning and end is "jeux sans frontieres," which is French for "games without frontiers." It is frequently misheard as "she's so popular."
This song is about the childish antics of adults, which are especially prevalent when their countries are competing in the Olympics.
Gabriel wrote this before the US boycotted the Moscow Olympics in 1980, an event that reinforced the theme of adults acting like children over silly games.
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