1. The act of judging/categorising someone, based on their face.
2. Teasing the formation of someone's face in a judgemental fashion.
Bully: oi your nose should be around 0.362 millimetres to the left!
Victim: Wow stop looking at me so closely pervert, ooh and that's facial discrimination (thanks pengueleon for that new word you're so cool and you should get word of the week.)
A crutch used mostly by blacks and sometimes hispanics to explain that they are not successful because of their skin pigment, ignoring other factors such as their education and/or work product.
My ho axed fo a job at Walmart but they be discrimination on us bros.
When you are among a large group of people (Usually people you don't know, like at school or a train station or a store) and suddenly the air becomes occupied by a nasty odour.
The act of "smell discrimination" comes into play when you decide by the people who surround you and their physical appearance/demeanour, who it is that created the disgusting smell.
(In a store)
Guy 1: "Dude, something smells like rotten eggs. I think it was that fat hairy guy over there" *Points*
Guy 2: "That's smell discrimination! It could have just as easily been that hot girl in the pink tank top!"