Simplify the following text for a Grade 5 native English-speaking person.
Original: `` Piss '' and its association with vulgarity has led to its current classification as obscene , as well as its use in such colloquial expressions as `` to piss off '' and `` piss poor '' . Euphemisms such as `` pee '' are used , but there are many more for the act of urination .
Simplified: Some slang terms for urine are `` pee '' and `` piss '' .