A live or pre-recorded audio and/or video session that uses the Internet as the broadcasting and distribution medium.

Audio and/or video data is compressed and packetized into a specific format, predetermined by client-side software, so it can be streamed over the Internet.
"I'll be doing a live webcast tonight on uStream, and then another one on BlogTV"
by Alfred_FL February 08, 2009
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The art of twisting ones self up on a swing and masturbating then when you are ready to ejaculate let go of the ropes spreading ejaculatory matter like a web.
The floor is sticky from your webcasting.
by GottagoJo March 05, 2019
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