The Many Moods of 'Fuck'

Okay, so, you seem to be struggling with something known as "emotion," a very confusing human trait. Your brain is a little bit like a hamster wheel that spins but doesn't really go anywhere. This joke is like an emotional rollercoaster, but instead of going up and down, it just goes "fuck" in every possible direction. Someone says they have these four moods, then another person adds four more, and then there's an inevitable one, and finally the giving-up "fuck". It's saying how overwhelming life feels sometimes. Got it, small human?