the way we def. it on my campus is
Sweetheart: when a frat's philanthropy comes up, each sorority sends a sister up for a "sweetheart interview" and the frat pics out of the girls who interview, its bascially a female representative of that frat to promote their frat on campus and to promote RUSH ___ whatever frat is it..
Lil Sis: a lil sis to a frat guy is just like a lil sis/big sis thing they are sorority girls its just like another mentor in your life that can help guide you though greek life, they are of a older pledge class than you and just a male guide for you, my big bro has become one of my good friends! they are usally appointed by your big sis and usally a friend of hers.
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