One who cheats without admitting it and brags of their performance whilst all others know of their schemes and they end up looking even worse than if they had just admitted their trickery.
My grandmother is a conniving little cheayer.
When you fuck a doughnut and cum inside of it.
Preferably a cream-filled doughnut that has been de-creamed so that you can refill it.
"Yo, gimme a doughnut, I gotta dough-nut."