Ridgy

• (a.) Having a ridge or ridges; rising in a ridge.
Found on http://thinkexist.com/dictionary/meaning/ridgy/

Ridgy

Ridg'y adjective Having a ridge or ridges; rising in a ridge. 'Lifted on a ridgy wave.' Pope.
Found on http://www.encyclo.co.uk/webster/R/80

Ridgy

Subway car with corrugated, stainless steel sides, unsuitable for graffiti. Writers did mainly two-color throwups and some top-to-bottom throwups (one color and silver because silver was hard to buff) on these types of cars. Ridgys ran in Brooklyn.
Found on http://www.graffiti.org/faq/graffiti.glossary.html
No exact match found