This is a mash up of “get your act/shit together” (get organized) and “get off your ass” (stop loafing and get to work). Both idioms direct someone to get moving, invoking a congruent conflation. Also ass and act are three letter words that have a similar sound. Finally, the lower half of the body is at work here in both phrases. Many thanks to Robyn Pietrucha for blurting this one out and passing it along!
This nice congruent conflation is a mash up of “get our ducks in a row” and “get our shit together”, both meaning to get organized. This beauty was uttered by the Mistress of Malaphors, Naomi David. Thanks again Naomi!