Diccionario de Colombiano Actual
Francisco Celis Albán
Intermedio Editores, una división de Círculo de Lectores, SA
Bogotá - 2005
The slang is relatively "nacional" but seems to lean toward "expresiones bogotanas". (Medellín has its own argot.) Many terms are given in context.
I find the book useful and interesting. I bought mine at a "La Nacional" bookstore in Cali. It was the only copy I found although I browsed in stores in Bogota and Medellín. If you have a need for Colombian slang, I hope you can find a copy.