Nail Bait
When a guy uses another guy like a walking ad to get a girl. The second guy might be a random or just someone the girl knows. He's just there to make the girl fall for him like an idiot.
My friend used his neighbor to get my crush. The neighbor looked like he didn't want to be there.
That guy used his friend's friend to get the girl from the party. She thought he was totally cool.
My brother used his friend to get my sister's friend. The friend looked like he wanted to run away.