girly..
not to be confused with Shoujoi ai.. but i guess that would emcompass it as well.
For an example series such as:
KareKano, SaiKano, Fruits Basket, etc..
Shonen anime is more geared towards boys.. and would be
YuYu Hakusho, DBZ, Fist of the North Star, Beserk, etc..
Sure some series contain elements of all genres.. but it's just a general term.
For more info check out
this page. It's pretty helpful in breaking down the gender based specifics of anime/manga.