The photographer of the friend circle. He is always seen moving around with a dslr camera hanging from his neck.
Sometimes it is just for showing off.
The term is often used sarcastically, to refer to guys, who become this type of wannabe photographers, just to be close with girls who are selfie queen.
"Hey how come Dave is hanging out so much with those girls these days?"
"Haha...he's only the 'dslr guy' to them."