An exclamation used when you see your friend looking so impressive that you can't contain your emotion and enthusiasm (regardless of name and gender, sexual or romantic orientation).
Josh: Damn Daniel!
Daniel: *smiles appreciatively*
Josh: DAMN DANIEL!
Daniel: *struts and werks the camera a bit*
Josh: DAAAAMN DANIEL! Back at it again with the white Vans! lol
Sam: DAMN DANIEL!
Lexi: Oh no...not again. lol
Sam: DAAAAMN DANIEL! Back at it again with the red dress!
Lexi: Haha, thank you!
Logan: Damn Daniel!
Taylor: *looks around*
Logan: DAMN DANIEL!
Taylor: My name isn't Daniel...o.o
Logan: I know, but DAAAAMN DANIEL! Back at it again with the fresh haircut!
Taylor: lol thanks for noticing