Hai Hai
You say this to make fun of someone who got hit on by someone ugly, or to cheer someone who got hit on by someone hot. It's like a two-sided insult and compliment.
Hai Hai! You got hit on by that guy who smells like a gym and eats pizza for breakfast.
Hai Hai, you got a hot guy to notice you and you're acting like it's the best thing ever.
Hai Hai! That guy who hit on you looks like he just got out of prison and he's still ugly.