IPA: /ˈskɪdiər/
KK: /ˈskɪdiər/
More likely to skid or slide than something else.
The skiddier road made driving more dangerous during the rain.
Comparative: skiddier
Superlative: skiddiest
The word 'skiddier' is derived from 'skid' (from Middle English *skiden*, meaning to slide or slip) and the comparative suffix '-ier' (indicating more). Thus, 'skiddier' means more likely to skid or slide.
Think of something that is 'more slippery' or 'more likely to slide' — that's what 'skiddier' means.