Other definitions of H:

• This letter became a meme response to throw people off, because there is no actual definition, it's just a space filler that is meant to send others into searching or asking for definitions.
• A space filling answer to any prompt. Same as typing a blank response, making it brilliantly useless.
• A completely meaningless answer for when you cannot think of anything to say. Some may try to imply the letter is perverted, but in most cases, assume it's just nonsensical.

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