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1.
v. The act of multiple friends intentionally loading the same pornographic video simultaneously from their respective computers and masturbating to said video. This is often coordinated by phone, which is commonly left on speaker throughout the video. In more serious cases, the friends will enter a video chat room with each other through services such as those provided by Skype and AIM.
Example 1:

Dylan: "Hey, man. Got any plans after class?"

Cody: "Well, not really. I'm probably just gonna go home and fap."

Dylan: "Same, bro! We should totally sync up."

Example 2:

Dakota: "Hey, guys. I found this really hot vid on the net. You guys all wanna watch it at my house tonight?"

Matt: "Hell no. That's fucking gay."

James: "Matt's right. Why don't we just sync up instead?"
by Yuletide Piirate March 28, 2010