CTHU
CTHU definition by Slang.net - The Slang Dictionary
This page explains what the acronym "CTHU" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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CTHU is an acronym that stands for "Cracking the heck up," which is another way to say that you are laughing a lot. It is typically used in text messages and online to reply to something funny.
The acronym is typically used by slang-savvy people who often utilize slang acronyms and abbreviations. Therefore, it shouldn't be used with most people because it will most likely confuse them.
Also, "heck" is a substitute for "h***," which may offend recipients. Some examples of when CTHU is used is in reaction to a funny video shared on Facebook or when someone texts you a hilarious story.