These are the tattoos found on various parts of a slag's body. When said slag went into the tattoo parlour, they belived they were getting some meaningful hieroglyphics with deep and ancient derivation ... wrong. From: slag + hieroglyphics.
Tattoo dude 1: "Hey! I just gave some fat minger a real set of slagoglyphics."
Tattoo dude 2: "What they say?"
Tattoo dude 1: "I just wrote 'I AM A COCKSUCKER' in Japanese - got the graphics from Google!"