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Verb. sing-kruh-fuhk
The rare case of either twins or clones (or syncrofucks*) having sex with either twins or clones (or syncrofucks). The entire performance and finish must be exactly the same at the exact same time.

*noun - children from the act of syncrofuck.
"Hey did you see those twins at wet willies?"
"Oh, they're not twins, their fathers were identical twins who married identical twins. Then since both mothers and fathers were identical twins they decided to syncrofuck and have identical children."
"No shit?!"
"Just ask them."
by MishaOdessa January 25, 2010
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