"having outward-bent or crooked legs," 1680s, a reference to the bandy, the bent stick used in the Irish field game of bandy (n.).
Entries linking to bandy-legged
bandy n.
Irish ball game, precursor of field hockey, 1690s, played with a curved stick, also called a bandy (1620s), from bandy (v.) "throw to and fro, strike back and forth."