there might be a list, but im bored at work:
urm- under represented minority i.e. black males, native american princesses (see Pokeahotass)
splitters- combos of high gpa/low lsat or vice vers
t14- top 14 schools, all have been there on usnwr for a long time
ttt- third tier toilet (also see tttt fourth tier) a derogatory term applied to a certain school (see Cooley) or number of schools, whose rankings may vary based on the context, so cornell could be a ttt to a hys student
hth- hope this helps, (usually sarcastic) although some people dont know this because they fell for the sarcastic advice given to them so much as to take the hth seriously