two left feet, have
Be clumsy, as in I'll never get the hang of this dance; I've got two left feet. This expression conjures up an image of feet that are not symmetrical, as left and right are, therefore causing imbalance or stumbling. It was first recorded in 1915.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.