A logical fallacy whereby someone points out that one thing is better than another when, in fact, both items in the comparison are horrible.
Person A: "I'd much rather hook up with Girl-X, she's better looking than Girl-Y."
Person B: "That's like saying you'd rather drink a turd milkshake instead of being beaten savagely with cacti. While the turd milkshake may arguably be better, it's still a turd milkshake and it still sucks. My point is that you shouldn't sleep with either of those heinous-looking girls, and your turd milkshake fallacy isn't helping your argument."