why didn't you tell me that you and miranda navas used to be friends? i say to olivia the next day. i'm really annoyed at her for not telling me this. it's not a big deal, she answers defensively, looking at me like i'm weird. it is a big deal, i say. i looked like an idiot. how could you not tell me? you've always acted like you don't even know her. i don't know her, she answers quickly. i don't know who that pink-haired cheerleader is. the girl i knew was a total dork who collected american girl dolls What does dork mean here?

when i get to the subway station two blocks away, i see the same three kids hanging out in front of the bagel place next door. they're still laughing and yuck-yucking each other like they're some kind of gangbangers, little rich boys in expensive skinny jeans acting tough. don't know what possesses me, but i take my glasses off, put them in my pocket, and tuck my fiddle case under my arm so the pointy side is facing up. i walk over to them, my face scrunched up, mean-looking. they look at me, laughs dying on their lips when they see me, ice cream cones at odd angles. yo, listen up. don't mess with jack, i say really slowly, gritting my teeth, my voice all clint eastwood tough-guy. mess with him again and you will be very, very sorry. and then i tap my fiddle case for effect. What does "yuck-yucking" mean here?