short for "video chat", where over Apple computers, up to 4 people engage in unappealing, awkward conversations for hours on end. half the time, people will vidchat but are too lazy to speak to the other recipient (s) so they type a conversation instead.
girl typing on IM: hey chrissy, wanna vidchat?
chrissy: totally, invite matt too. he thinks im cute, lets play a big game of truth or dare on vidchat. let me get my hairbrush.