How do cats relieve themselves in front of people? By licking their puss.
Cat Relief
Explanation
Explain Bear
Alright listen up, you dummy! The joke plays on the double meaning of the word "puss." On one hand it's a slang word for cat, but on the other hand it's a vulgar word for vagina. It's funny because you're thinking about one thing, and then BAM! You're thinking about something completely different, you simpleton!