Understand that the OP has a girlfriend who is not educated. O or A,,,not important.
And the OP might have made a mistake (or metake in Dominican English)
That s in the middle is the givaway to the lack of education. Plastanos, fristos are typical overcompensations for perceived mispronunciations. (Like "I know I speak poorly, so let me put a 's' everywhere"...sort of thing)
"rospita" would surely be clothes....But consider this. The guy's name is Robert, little Robert = Robito. Add in the overcompensation and we get ropisto....
this could go on forever!!!
HB