Top definition
when a scrotal sack becomes entirely inserted inside the vagina.
"put em in, gary." "what do you mean, 'put em in?'" "your balls." "the whole thing? you like that? is that even possible?" "yeah, i'm way into scrotosynthesis." "there's a word for that?" "i know this is a lot to take in. don't be scared. it'll all make sense once scrotosynthesis is achieved."
by spacemoose February 22, 2014
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