A demonic spell which summons a dog which has a demon sealed within it. To perform the spell, one must chant "yorkums" three times in front of a bathroom mirror, then flush the toilet in that same bathroom. After 5 seconds a small dog will appear in the room. What happens after is up to you to figure out.
Danny: Yo did you hear, Jonny performed the yorkums!
Jack: No way! No wonder he hasn't been at school for a week.
Your bum, but in the context of a destination, rather than a body part.
Sally: What do you want to do tonight?
Mike: Well, I haven't been to Yerbum in a while...
Sally: Oh, you wanna go there tonight?
Mike: I love Yerbum. I'd go there every night if it was open.