a gay male, who can't love another boy, because hes too "busy" and he probably doesn't want to accept the fact that he is a fag. As a result of these douche bag fags, awesome people end up getting hurtin the end
Joesph: oo i cant come see you today, im uhh busy
Patrick: uhh its been like 3 weeks since you've come out
Joseph: Well i wanna get a tattoo of Michigan on my non-existent abs
Patrick: What a douche bag fag, i'm calling kyle
It's actually 2 expressions combined, duche bag (- historically known as an instrument of cleanliness bestowed upon a dirty piece of female genitalia) and fag(Short form for faggot aka homo).
This expression is used when a duche male is sleeping with a lot of other men. He's like a male - gigolo, for men!