Pornographic magazines used the word to describe the facial expressions of female live-action porn actresses during orgasm.
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Others are acmegao (アクメ顔) from the French loanword acmé (orgasm), and yogarigao (よがり顔) "satisfaction face". One of these is ikigao ( イキガオ) meaning 'coming face'. There are several other names for the facial expressions made at the moment of orgasm.
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Thus, ahegao can be interpreted as 'moaning or panting face.' The second part, gao or kao ( 顔) means 'face'. The first part of the term, ahe ( katakana: アヘ) is an abbreviation for aheahe ( アヘアヘ), an onomatopoeia for 'pant' or 'moan'.