Rinse off is a term for showering. Me and my bestie bae use it when we want to be #funny because it's our inside joke.

To cleanse one's bottom, using only saliva and tongue.

Spray sperm on your significant other

(Noun) Also known as a Doncaster Douche.
A form of post-ejaculatory contraceptive douche carried out by the male whilst his penis is still inside the vagina. After ejaculating inside his lady, the gentleman urinates within her, sluicing out his spermy man-milk. Purported to be 95% effective, by someone, somewhere, probably (depending on volume of piss).

When a person goes to the Hair Salon to get their hair bleached blonde but the normal stylist off off sick, so they settle for the trainee Scissor Monkey who has never done it before - thus ending up with a Rusty Rinse.
Or when a Girl buy's a shit Blonde Colour off the shelf in Poundstrecher and gets her mate to put it on for her after 3 bottles of Lambrini.

To wash your genitles in the kitchen/bathroom/laundry sink.

The action taken when you catch your girl or your lil movie on a sneaky link.