Social site, very similar to myspace, myyearbook, or facebook, containing many chat rooms. Usually used on cell phones but can also be used on a computer. Site allows people to propose or have"relationships" or a relationship status such as engaged, married, hooking up,going steady, in like with,its complicated, and best friends forever with other site members. Also known as moco boos. Site also includes instant messaging.
"Dude i met a super hot chik in the Mocospace chat room. I asked her to be my Moco boo!"