'Webeast' is a term originated by the lethal gang members of Grease My Weasel aka GMW. 'Webeast' is often used to describe somethig that may be amazing or brilliant, but in a less camp way. It is also used in a sarcastic or ironic context.
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.
A: "Yo... what´s between you and María... that virtual bullshit?"
B: "We are webmates, we go to bed and wake up connected by the web... clean, economical and blissful relationship!"