Lyric discussion by anakoluthon 

Cover art for Contrecoup lyrics by They Might Be Giants

"This song was first recorded in 2005 when John Linnell was challenged by the radio show The Next Big Thing to create a song using the almost-forgotten words contrecoup, craniosophic, and limerent. The Else's version contains a new bridge written for the song's inclusion on the album, and has more of a "full band" sound." - tmbw.net This explains the discrepancy between the OP's lyrics and AdmiralThrawn's.

Also, i'm pretty sure the bridge is: Which is to say how it goes / Couched in terms no one knows. And as if the choice were slim / As if there's no synonym.

In other words, Linnell is saying that the language of the song is deliberately obscure, using words no one knows as if there's no synonym.