A “Colombianada” is usually something humorous that has taken place here in Colombia and shows the Colombian ability to laugh at his fellow national and himself. This is not pejorative and neither is it insulting, just as in the same way you can have a “mexicanada” or a “peruanada“.
Check this Colombianada out that I saw yesterday on the road from Mompos back to Bogota yesterday. I couldn’t believe my luck!
Thankfully we now know it’s a Renault 9.
For further Colombianadas please see this site.