also: うれしょん
noun
excitement urination; peeing from excitement
Colloquial term for accidentally urinating due to extreme joy or excitement, often used for pets or small children.
子犬が飼い主を見てうれションしちゃった。
The puppy got so excited seeing its owner that it peed a little.
うれションは犬によくあることです。
Excitement urination is common in dogs.
A blend of 嬉しい (ureshii, 'happy') and しょんべん (shonben, 'pee'), a colloquial term for urinating from excitement.