Not just holla-ing

Aight fellaz, help a brotha out here. I'm from NJ, and yall women down here (looking all good and everything) have brought me to a problem. Most of the women at these hbcu's are used to getting holla-ed at left & right, so how would you let a girl know that you're REALLY interested in her, and not just trying to holla at her like the rest of the guys, before she blows you off as just another guy holla-ing at her for her number?