pick flowers
verbEtymology "Picking flowers" is a sufficiently obvious excuse for separating from a group and squatting down outside that it is found in a wide range of places and languages, from Britain to Botswana and Japanese to Isan.
1
Euphemistic To excuse oneself from a group and urinate or defecate outdoors.
2
Used other than figuratively or idiomatically: see pick, flowers.