I've seen it used on social media.
Most Helpful Girl
Purposefully misleading and attention-grabbing titles, I think. Like when people ask 'How does my cock look?' and it's a picture of a rooster. They don't have to be dirty, most spam ads you get have clickbait titles.3
Most Helpful Guy
It mean's a link that's given a title or image that people tend to want to click on, but typically lack in content. Since content creators are often payed by views and not by user satisfaction, it is a way of making money on the internet without producing quality content.
Thus, people tend not to like it.2