Here's a few of the choicest, either because we used them a lot back then or because I've explained them on Jackie's Joke Hunt.

...for the entire Colorado Number System, click on this sentence...

1. *If it was up your ass, you'd know where it was
(*1973 Number of the Year)

2. Your face is killing me
(deuce. pair. how many to tango?)

39. *Get me a beer
(*1974, 1976 Number of The Year)

44. *Stoned again...
(*1975 Number of the Year)

77. Toss that rag
(oral sex during her period...)

85. *You tell me
(little old lady jokes)(*1977 Number of the Year)

105. My first wife used to say that
(M.C., thanks) (*1978 Number of the Year)