drop the kids off at the pool
/drɒp ðə kudzu ɒf ət ðə pu l/ phr. v. (slang, humorous, vulgar) 1. To defecate; to go to the toilet for a bowel movement. 2. To engage masturbation, until climax, into a toilet. Etymology: Figurative and euphemistic expression popularized in late 20th-century American slang. The “kids” metaphorically represent faeces, and the “pool” the toilet bowl. Usage reflects a broader tradition of humorous circumlocutions for defecation. Modern day usage developed into a meaning for self-relief, for either healthy bowel movements or acts of self love.
e.g. "Where is your toilet closet? I need to drop the kids off at the pool!"