hell on wheels 

Used to describe someone or something (maybe a pet) that is tough, aggressive and hard to handle.

My 17 year old daughter is hell on wheels - she comes and goes without permission.

hell on wheels by Bomni February 10, 2005

Hell on wheels 

Figurative for a hard-driven person with a mean streak.

An infamous nun in the Seton Keough community in Baltimore County, Maryland was actually called "Hell on Wheels"-- because of her name (Sister Helen Mercedes, which was obviously to pun) and her reputation for cruelty toward students at Seton Keough High School (which was two separate schools while "Hell on Wheels" was there).

Hell on wheels by Nickidewbear August 22, 2011

Holy Hell on Wheels 

A word often used when cut off in traffic or shocked into a state where once would usually say "oh shit". Also a contradiction in terms.

Car: Swerves
You: Holy Hell on Wheels!

Holy Hell on Wheels by Crimson September 14, 2004