The last time I heard that was my geography teacher in high school when he referred to my drawing lawn mowers in class. He called them motor mowers and even back then in year 9 in 1988, I thought that was an odd term to use for them.

Speaking of how to write the description of a petrol powered grass snipping apparatus, is lawnmower grammatically correct or should it always be lawn mower?

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!