Something
said in
response to
someone getting owned. Can also be applied to other objects, as in "C me," "C him," "C them," etc.
Your buddy: It took me 20 minutes to get to your
house because of this old lady driving in
front of me.
You: Heh, CU!
Your buddy: Yeah, but since it took so long, the ice
cream I brought melted.
You: Ooh, C us.