An expression of abject surprise; the user is so shocked that he/she has transcended the boundary between noun and verb and utilsed the word 'cock' as the latter.
Prima: Dude, Elly just pissed all over your cat while it was sleeping.

Secunda: Cock my bum.
by Michael B Hawke October 06, 2009
Get the mug
Get a cock my bum mug for your coworker Jovana.
This is a couples' game; you blindfold one participant, then the other person sticks a digit in their bum and a digit in their partner's bum, one digit from each hand.
Then, wave the differing fingers under the blindfolded participant's nose, to see if they can guess which finger is which, whilst repeating with each finger swap... "My bum.... your bum?!"
Let's play my bum your bum...

I recognise that shit smell anywhere.... that's not my bum , that's YOUR BUM !
by dylanpenguin August 09, 2017
Get the merch
Get the my bum your bum neck gaiter and mug.
lick someones' ass
they didn't give me the job...they can scum my bum!!
by michael foolsley December 08, 2009
Get the merch
Get the scum my bum neck gaiter and mug.