dipsy-do
n.—Gloss: another way of saying “an up and down (motion or change).” Note: The Dictionary of American Regional English has a similar term, “dipsy-doodle”, which is defined as dip in the road, or a “thank-you-ma’am.” «Since he started as a realtor in 1971, Love has weathered the highs and lows (or, as he calls them, “dipsy-dos”) of Burnaby’s housing market.» —“Realtor sells bungalow five times” by Brooke Larsen Burnaby Now (Canada) Oct. 3, 2007. (source: Double-Tongued Dictionary)
Further reading
Suzanne in Tucson, Arizona, says her mother used to say the following to her quickly: Will you? Won’t you? Can’t I coax you? Aw, c’mon! You said you would! You think you might? You promised me! Won’t your mama let ya, huh...