What is the meaning of I always see lol and wow in dota2(this is game),what meaning?? - Question about English (UK)

Definition of I always see "lol" and "wow" in dota2(this is game),what meaning?

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I always see lol and wow in dota2(this is game),what meaning?是什么意思？ -关于英语(英国)（英文）

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