A two part process of showering (clean) and masturbating (jerk). The clean does not necessarily come before the jerk, in fact more times than not the jerk precedes the clean. The engaging party often feels a sense of accomplishment upon completion of the clean and jerk as they have killed two birds with one stone.
Person 1: Hey man you about ready to go?
Person 2: Not yet dude, I'm gonna hop in the shower and clean and jerk before we leave.
Person 1: Well make it a quickie cause we gotta be there in like 20 minutes.