ORIGIN
early 21st century: from English, a combination of the phrase "sweet pea", an informal term of endearment for a woman, and the word "pee". The current sense may also refer to a woman's private area being called a "pea" in English vulgar slang.
I was sweet peeing in the shower because my husband can't get it up anymore | I understand we all sweet-peesometimes, but you were doing it for five hours!