tid ‧ dly /ˈtɪdli/ BrE AmE adjective British English informal
[ Sense 1: Date: 1800-1900 ; Origin: Origin unknown. ]
[ Sense 2: Date: 1800-1900 ; Origin: tiddy 'very small' (18-20 centuries) ]
1 . slightly drunk
2 . very small:
a tiddly little insect