hēi
hey
This is an interjection or onomatopoeia — it represents a sound.
阿嘿颜
ā hēi yán
variant of 阿黑顏|阿黑颜[a1 hei1 yan2]
嘿咻
hēi xiū
(coll.) to make love
嘿嘿
hēi hēi
(onom.) he he
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