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