while you’re down there
Something a person might say when another person is below his or her waist (be it picking up a dropped item, recovering from a fall, etc...) It implies that the upright person would like to receive oral from the lower one, since they’re so conveniently positioned. More often performed by females to males since women are better at multitasking.
“Hey, Abby... while you’re down there looking for your contact lense, mind giving me a blow job?”