Sandcastle is a superior multi-meaning term, only used for those who are worthy. It can represent the inferiority of bottoms and the glory that is hentai. Other meanings remain a mystery though the term “sandcastle” is worshipped like a cult.

Long live the sandcastle.
Person 1: “Sandcastle moment lol”
Person 2: “.... The hell does sandcastle mean?”
by UnknownUsername1234 October 3, 2020
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When you got skinny dipping at the beach and y’all have sex after and it feels like mounting sandcastle
Went swimming naked with this chick the other night and when we fucked after I gave her a sandcastle
by boydie January 30, 2018
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