DMD3,
Jack is right of course. Similar to "going off the deep end". Gordon's songs are full of expressions and phrases that were in use or popular at the time he wrote them but if you didn't live through it you might not catch his meaning.
As an example, listen to the theme from the Flintstones some time. When they say "we'll have a gay old time" they are not referring to the common usage of the word in 2003,LOL.
Bill