Dirty Weetabix
A sex act, in which the receiver sucks a fart out of the aggressor's Anus. The act was allegedly first performed by a cornish man looking to supplement his choice, staple wheat breakfast block, with a lightweight and less colorific, airy alternative, owing it's name - The dirty weetabix.
'Ere now, where you to with my bloody fart box bitch, I needs me dirty weetabix quick fast.