Top Definition
Similar to a Webinar (seminar via the web), except while watching porn and taking care of business yourself.

:To jackoff to online videos, Powerpoints, etc
Dan: Damn, it's hard to stay awake during these webinars

Mike: Bet you wouldn’t have fallen asleep if that were a jackinar.

Dan: no , just my hand would have.
by Mealoil May 14, 2009
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