(tr. verb) - The act of trying to manipulate someone by making them feel guilty. Note that this is a transitive verb, so that if John guilts Mary, then John is making Mary feel guilty.
Another variation on this is "to guilt (someone) into (something)".
Chris: Could you go pick up a 12-pack of beer?
Mike: Aw man, I'm too drunk to go. Kevin's coming over soon. Call him.
Chris: Well, OK, I guess I can wait. I'm cooking dinner for us after all, so I probably shouldn't drink any more right now.
Mike: Chris, come on --
Chris: So how's your job? You know, the one that you love and never would have gotten if I didn't send your resume to my friend Alice?
Mike: All right, all right, I'll go. Geez! You don't have to guilt me!
Jake: Goddamn it, I gotta go shoe shopping with my girlfriend. I promised I'd buy her a pair of Pradas.
Dan: Pradas? What the fuck is that?
Jake: Expensive-ass shoes.
Dan: What are you doing that for?
Jake: Eh, she guilted me into it because I forgot her birthday.