The official definition of flave, or "to flave", or "flavin" is the act of communicating with the opposite sex in order to retain and master the skill of conversation with the opposite sex. One might also use the word macking but that term is too intimate whereas flave can just be both friendly and intimate.
A saying that goes along with this is "A Flave a day keeps the gayness away" then again... Gay people can flave too.
After sending a few hours in the library Carl might have to leave and walk around the common area simply to speak with some females that are around. After Carl comes back
Jake asks: Carl, Where you been it's been like 45 minutes..?
Carl: I was just flavin. Went to get a coffee and saw Angela and I had to flave. She's too fine.
Jake: Oh I feel you. A flave a day....