Popularized by online skits featuting Cam'Ron and Brandy and social media influencer Talibah Bratton, it is the alternative pronunciation
of
eleven (11) in order to be consistent with other homogeneous digraphs (
two instances of the same number or character such as 22, 33, 44, 55, etc.). The suffix "-ty" translates to "multiple of
10", so it is the short written form of one *
ten plus one. Alternative spellings and pronunciations include "onee-one" and "oney-one" or could also be denoted as "oneteen."