S.F.L.A.N is an abbreviation of the term "Sucka for love ass nigga", meaning a man who will act a complete fool and do anything for a particular woman. It was popularized infamous Wu-Tang Clan member , Ghostface Killah.
Yo you spent all your rent money on a pair of new boots for that chick? You's a SFLAN for real. Suka for love ass nigga.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!