What does it mean when a girl says "You crack me up"?

soxfan94
A lot of times girls say things that seem like flirting without meaning it that way, but I want to know in general if something as complimentary as "you crack me up" or "you're such a funny guy" is usually intentional flirting, or just a casual comment?
What does it mean when a girl says "You crack me up"?
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