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.
Sometimes written as bl*nkshipper, a blankshipper is a word used to describe people who ship the characters Emmet and Ingo from Pokemon, who are canonically brothers.