A stick that has the magical property of turning anyone touched with it, ugly. A beating from the ugly stick will have a much more severe effect than just a casual touch.
Ugly sticks are rumoured to come from Ugly Trees, which in turn can be found clumped together in ugly forests.
1) Christ, she ain't half been beaten with the ugly stick.
2) Bloody hell, she fell out of the ugly tree and hit every branch on the way down.
3) She must have come out of the ugly forest to get here and hit every tree on the way out.