Entry 1 sense Webster, 1913 itsy-bitsy /ĭtˌ-sēb-ĭt'-sē/ · it·sy-bit·sy · IPA /ˈɪtsi ˈbɪtsi/ 01 a. very small; tiny. 1. very small; tiny. “It was an itsy-bitsy teeny-weeny yellow polka-dot bikini that she wore for the first time today.” — Song lyrics Syn. bitty, bittie, teensy, teentsy, teeny, wee, weeny, weensy, teensy-weensy.