Euphemistic. Same as 'Shake Hands with Tommy Tank' or 'Making Love to Madame Palm and Her Five Lovely Daughters' or even 'I'm Going to do a Barclays'
SON: Don't come in Mum, I'm trying to meet Weird Al Spankovich.

MUM: Are you fucking wanking in that bathroom again?

SON: Maybe. (Ughhhhhgggh.)

MUM: Well hurry the fuck up, I need to shit as well and your Dad's downstairs fucking your sister in the other toilet.

SON: What?

MUM: What?
by Sir Bartholomew McTavish February 17, 2009
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