1) what CSI does -- figuring out how a dead body became dead
2) investigating someone who seems shady or not truthful to you
3) the situation is over and done with, dead.
4) no longer dating a person who gave you too much drama
1) the CSI team's gone corpsin
2) Someone saw his car at some other girl's house, let's go corpsin.
3) The test is corpsin.
4) She lied to me one too many times, she's corpsin.