A sexual or pseudosexual act of rejection. The rejected partner is woken in the early hours of the morning preferably whilst sleeping on white bedding and subjected to a high-pressure curry fart to the head, permanently silhouetting their shocked expression into the pillow. For a true 'banksy' one must accuse them of not getting the joke afterwards.
(Adjective)
A term used to describe a particular piece of smug, over-the-top, excessive or needlessly flashy piece of art or metaphor designed to convey a simplistic or obvious message in a needlessly 'wowy' way.
The term is derived from 'Thanks Mr Bansky'(referring to the artist of that name) to create the phrase 'thank mr banky', but simplified with poor spelling and lack of proper grammar to better reflect the snarky nature of the term.
"This piece of art is very banky"
"The message is obvious, this is just a banky image"
(In response to a banky image) "Thank mr banky"