The joke:
My hotel tried to charge me ten dollars extra for air conditioning. That wasn’t cool.
The joke is a pun that uses two different meanings of the word "cool."
- Meaning 1 (Temperature): Air conditioning makes a room feel cold or "cool."
- Meaning 2 (Behavior): In slang, if something is "cool," it means it is fair, good, or acceptable. If it "isn't cool," it’s unfair or rude.
The punchline is funny because it works both ways: the hotel was being rude (not cool), and because you didn't pay the money, your room stayed hot (not cool).