thank-you-ma'am

[ thangk-yoo-mam ]
/ ˈθæŋk yʊˌmæm /

noun

a bump or depression in a road that jars a person riding over it.

Origin of thank-you-ma'am

An Americanism dating back to 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019