The act of having sexual intercourse with a girl doggy style (vaginal or anal), pulling out before orgasm and ejaculating all over her back and arse. At which point you would give the girl a massage using said semen as a massage oil substitute. The end result should give the girls spooge ridden body the desired resemblance of a glazed ham.
Man! thats the last time i forget to bring baby oil, I ended up having to give that girl a Glazed Ham.