The Urban Dictionary has a concise, if unsavoury, definition.
I'm just Twitter looking for some more anal bum parties.
A tourist travelled in London and overheard the words above. What does "anal bum parties" mean?
I am not a teacher.
Sounds self-explanatory to me, albeit somewhat tautological.
I think it's a reference to Susan Boyle, who sent out a hashtag to her album that had unfortunate consequences.