Do a Harry

Mid-masturbation with cats loose in your home, proceed to finish while said cat/s run through your legs, covering their fur in semen.

Person 1: I was at a party last night and I stroked the host's cat, but I met an unwelcome surprise as it seemed that someone had been careless enough to do a Harry, so needless to say I had to clean myself up with my tongue, in a cat-like fashion.

Person 2: Wow, you skirrowed it there mate.