The creation of a false MSN Messenger account with the purpose of pretending to be a hot chick to pull a joke on a friend by pretending to chat them up. Usually results in the object coming into school bragging about thier online achievements whilst people lulz quietly around them.
Name originates from the very first one created by school children, sexibexi@live.com.
George and Greg so totally set Richie up on MSN yesterday. They made the best Sexi Bexi ever.
To orchestrate social or informal arrangements, events, to influence the secondary plans of others (travel / accommodation) on the basis that there is said event to attend, and then cancel, pull-out or bail on entire event, effectively leaving prospective attendees stranded. This can sometimes manifest itself as a "Sorry i couldn't be there in person..." satellite beam-in.
"So then everyone cancelled and it was just me and him there."
"Really? How come?"
"Well the guy that organised the party has a habit and history of consistently Bexing It."
"Man, that sucks."
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.