Top definition
Sweet Neptune is another way of saying "oh my god" , "holy cow" , "oh my lord"

Neptune can also be used alone and it can mean: "being shocked", "being disturbed" or "suprised".
"SWEET NEPTUNE THAT SOUNDED WRONG!"

"OH MY NEPTUNE..."

"neptune no"

"MERCIFUL NEPTUNE" (sub for holy cow.)
via giphy
by chingandchang November 15, 2016
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