(adj.) Used to describe a person, especially a male, who seems to embody many female characteristics and mannerisms. Is not necessarily derrogative, just descriptive.
Q: Are you going to ask him out?
A: I don't know, he's kind of femmy, do you think he likes girls?
When a guy goes down on a girl on her period and keeps it in his mouth, then she goes down on him and keeps it in her mouth, then they kiss and mix it together (a.k.a. period blood and jism)