What is .///.?
used to mean blushing, in online chat,
derived from anime and manga, for when they blush, diagonal lines, usually pink or red, go across their cheeks and nose.
usually the more slashes you put, the more you are blushing
.///. -small or normal blush
.///////////////////. - heavy blushing
Guy: You looked really cute last night
Girl: .///. thanks