hell-on-wheels

hell on wheels

Extremely difficult, unpleasant, or aggressive. That woman is hell on wheels when she's angry, so don't let her into my office. I can already tell that this client is going to be hell on wheels to work for.
See also: hell, on, wheel
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

hell-on-wheels

n. a very impressive person or thing; an extreme type of person or thing. (Use caution with hell.) This little machine is hell-on-wheels for general woodworking purposes.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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