As so many have said, vulgar, disgusting, crude, etc. Chestnut has a precise call, "a prepared act, designed to get a reaction".
Unfortunately a chunk of any audience (eg, Norton or Ross, etc) reacts like kids hearing a naughty word, so when she drops a fart into the conversation, or her collapsed/ing/underused fanny, a subset gets the giggles and her eyes light up.
She was OK as part of a group exploring parts of India (BBC, The Real Marigold Hotel, c10 yrs ago?), when either she restrained her potty act, or they chopped it out of the broadcast film (if the latter, grateful thanks!).
These days she gets zapped as soon as she appears on a screen near us (we both detest her) -- lots of channels to watch (& if anyone hasn't seen 'Secret Garden' yet, try to catch it, wonderful photography, and brilliant info!).