ok translate plz plz plz plz

ok I hear in reggeaton songs alot about the words or saying tra tra tra short for detra ok what I know it means like get it from behind but some one told me it mean dance girl son like ok so what does it really mean

i've never heard it was short for detra. i was under the impression it was imitating the sound the snare makes in the dembow beats, but i could be wrong.