A spin off of the popular "oney-one" online skits featuting Cam'Ron and Brandy and social media influencer Talibah Bratton, it is the alternative pronunciation of twelve (12) in order to be consistent with other numbers between ten and twenty . The suffix "-ty" translates to "multiple of 10", so it is the short written form of one * ten plus two. Alternative spellings and pronunciations include "onee-two" and "oney-two" or could also be denoted as "twoteen."
The Ocean's12 movie featuring George Clooney, Brad Pitt, and Bernie Mac should actually be called "Ocean's Onety-two."