A girl of fairly tall stature who is relatively slim and has few distinguishable features. Often into indie pop bands/artists and mirrors that in her fashion style.Also almost always bisexual.
Yo, that girl over there is kinda pretty.
Bro, she's a Girl twink. There's a million other girls who look exactly like that.
Put simply- this word is the perfect way to describe your significant other that is more than a friend, but less than a commitment; (i.e: talking, friends with benefits, hanging out)