mound, lump, stealthily
嚭 is a rare kanji with meanings that do not share one clear conceptual center. It can refer to a mound or lump, and also to acting stealthily. The connection between these senses is unclear.
The historical origin of 嚭 is uncertain. It visually combines 喜 and 否, but the exact development and original meaning are unclear.
The left side 喜 suggests joy, and the right side 否 suggests negation. Picture a stealthy figure hiding a lumpy mound behind a joyful facade, secretly denying something.
For ヒ, imagine a stealthy person heaping a mound of dirt while whispering 'hee hee' to themselves: the 'hee' sound cues ヒ.