A toastfucker is one who fucks toast. Toastfuckers are widely known for their outlandish toast fetish, oftentimes displaying erotic behavior towards the very mentioning of toast. They tend to be either high, drunk, or stoned; a sober toastfucker is no toastfucker indeed.
My friend is a toastfucker; I saw him the other day, drunk off his ass and attempting to shove two semen-drenched pieces of toast up his ass.