Where I´m from Mongo (which I asume translate from mongoloid) is used like an insult outside of skate in every level, I noted mongo would came for that and I always used, but like you guys said in this thread could be wrong for this times.
Also, I don´t why, but when I started to skate I remember hearing from the older guys calling it ´YOYO´(Yoyo pushing I guess), but just like in my first year skating, never heard it again in 20 years, I guess with the time people started to read mags and stuff from US and stopped using and went with mongo.