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1.
A web-based seminar, term first used by Softchoice Solutions in relation to a web-based seminar for Microsoft products. Term entered mainstream usage after a thread was posted on SomethingAwful Forums enticing those that "attend" the seminar a free Microsoft Optical mouse.
"Register for the 'webinar' that is on Wednesday, March 24, 2004 from 11AM to noon PST.
It says you will get a free Microsoft Wireless Intellimouse Explorer with other prizes awarded later."
by Neodux May 11, 2004
 
2.
excuse to close door at work and masturbate
Jay bought lotion for the webinar.
by Kreme Brule May 19, 2010