See also; yada yada
Mostly used as a substitue to sexual descriptions, it can also serve to shorten or skip over parts of conversations. It allows the listener to fill in the blanks themselves with their imagination.
The phrase was used recently as a lyric in an Urban Hip-Hop Song; "Holidae In".
Chingy: "One thing leadin to anotha, let the party begin!"
"Well, me and my girlfriend were watching a movie, and..... one thing led to another and now I've got child support for triplets"