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A laughter suggesting something mischievous

Widely used in China, similar to "sounds interesting" in some situations.Usually used by girls to guys. An exact explanation is "I wanna say WTF but that's not the lady stuff and it's too cruel to you".

muffled laughter, suggesting a sneaky aspect to that being laughed at, differs from lol in this way, which is a full on belly laugh.

hehe, different from lol or haha. hehe usually has some type of innuendo. it is a subtle way to flirt via texting or instant messaging.

A giggle. Not a laugh, just a giggle. Generally you say 'hehe' after saying something cute, but it can vary.