This adjective has a two meanings. It is a combination of the words difficult and clit
1) A girl that is hard to get to sleep with you and or teases.
2) A girl that always has a problem with something and stops everyone from having a good time.
Dude, she's so hot but I can't get her to sleep with me, what a difficlit girl.
Why does she have to be so difficlit? Everyone just wants to have a good time and party.