Axis, Axle
For a car, the reason why it works is because its wheels spin on their axis. That is, they have axles.
Imagine a car whose wheels don't turn on their axis. It has no axles. Not a car that will work too well.
じく
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Your friend's car doesn't have axles, but he loves it anyway. He's all like, "Isn't this a cool car?" You reply: "Gee, cool" (じく) very sarcastically.
You're super sarcastic about this, so feel the sarcasm inside of you when you imagine this.