Actually, it's spelled "shillelagh". It's Irish for a walking cane (that can be conveniently used as a club or cudgel). Usually ornamentally carved. Common in Ireland but purchased by tourists for decoration/art.
Aye, dekko that culchie's shillelagh. Matches the tackies!
That knick-knack shop has outdated t-shirts and overpriced, hand-carved shillelaghs.