Glee's "Born this way" shirts?

So I love glee but i can never watch it so i always get the seasons on
dvd when its over and watch the whole thing. I saw video's on youtube
though and one of my favs from this season was "Born this way". Can
you tell me the meaning of some of the shirts I didnt get from
watching the episode?
Will: Butt chin
Rachel: nose
Quinn: Lucy Caboosey
Santana: Lebanese (I get this one but y is she sitting down and not
joining in the fun?)
Mercedes: No weave!
thats it. can you just tell me what these things mean because I dont
get them thanks!

By the way, just for fun. what would your shirt say???? Mine would
probably say shorty.