A person who should know how to do things, but fucks them up anyway, without consideration for impact it has on others.
Your Nan drives like a proper Cludger.
Where a female lubricates her vagina on the big toe of her male or female partner and then spoons the said lubricant into a glass container to be used in old age when her vagina is dry and dusty.
She gave me the dirty Gaynor last night for good measure.