A retard in its infantile stage. This could be 1. literal (a
retarded infant) or
2. metaphorical - describing something or someone that is so
retarded that it lacks basic functional skills, motor or otherwise.
1. Wow - considering they are both retards, I'm grossly shocked that their baby isn't a tardlet.
2. There should really be a tardlet showdown:
Snooki and Deena vs. All three Kardashian
girls. Winner gets the tardlet medal of honor!!
3. Dude I look like such a tardlet in that pic.