Nico

A guy whose personality changes drastically from sober to being high by any drug.

Usually a Nico is rather shy and quiet normally. However, you can see him without shirt singing football chants and talking to all the girls after some beers.

Girl 1 : Did you see Nico, this guy from our class, at the party last Thursday.

Girl 2: Yeah, he looks so quiet in the uni but what a Chad!