(colloquial, often childish or humorous) Alternative form of teeny-weeny
1872, Gail Hamilton, Our Nan and her dumb friend, ... Rose was no longer a funny teensy-weensy of an infant pig, but was now a half-grown, solid, fat porker ...
1900, Mollie Evelyn Moore Davis, The queen's garden, And there was a big-bellied jar in which the Queen's Henchman used to hide, and spring up at her, and frighten her, when she was but a teensy-weensy Princess like you.