When someone tells you the truth bluntly and doesn't sugarcoat it in any way at all but instead, delivers the truth in the rudest and worst way possible.
She told me that if I don't get my gap tooth fixed, I'll look like a hillbilly for the rest of my life and no one will take me seriously. She's such a blunt cunt.
A cunt blunt is a sex/drug act where the man bakes a batch of pot brownies, crumbles it, stuffs it into the vagina of a female, and then proceeds to eat her out.
The result is a pleasureful experience for both parties.
This is not to be confused with the Cleveland cunt-blunt, where the pot brownie is packed into the anus and then eaten out. The results of the Cleveland have led to mixed reviews.