Entry from OED Online

whoopsie, n.

ADDITIONS SERIES 1993

colloq.

[f. whoopsie int. s.v. WHOOPS int.]

In childish or euphem. use, a lump or piece of excrement. Freq. in pl. Phr. to do whoopsies, (or a whoopsie): to defecate.

1973 R. ALLEN Some Mothers do 'ave 'Em (B.B.C. TV camera script) 2nd. Ser. Episode 6. 45 Frank: I threw it at a dog. He was doing a whoopsie in the dahlias. 1984 Datamation 1 June 106/1 The company is counting on conditions getting better

as one Tek vp described it, ‘cycling through the whoopsies’. 1986 Didcot Herald 20 Mar. 2/2 A man is employed to pick up scraps of paper with a stick in the park and yet from before daybreak until after dark, people use the park for doggies to do whoopsies in. 1986 Punch Winter 9/1 The dog's done a whoopsie on the carpet. 1987 Courier-Mail (Brisbane) 9 Nov. 22 (caption) An oasis

the lifeline to a wandering soul. A tiny refuge filled with the nectar of the gods..And seagulls' whoopsies.