itsy-bitsy(s = adj.all) bittie, bitty, itty-bitty, teensy, teensy-weensy, teentsy, teeny, teeny-weeny, wee, weensy, weeny - (used informally) very small; "a wee tot"
very small; tiny. [WordNet 1.5]
"It was an itsy-bitsy teeny-weeny yellow polka-dot bikini
that she wore for the first time today." [PJC]
itsy-bitsy, adj. (also itty-bitty) colloq. usu. derog. tiny, insubstantial, slight.
Etymology:
redupl. of LITTLE, infl. by BIT(1)