hipsterのようなどんな単語でも探してください。
 
2.
The silent sign of respect
No words were spoken, just a slight upnod was all that was needed. upnod.com
jhickenによって 2010年03月25日(木)
 
1.
A form of greeting someone without using words.
Like a normal nod but insteading of stating with your head going down, it goes up first.

Lads normally do it instead of waving.
"Josh just gave me an upnod while i made a tit of myself by waving" :(
EJMCによって 2009年02月14日(土)
 
3.
The act of raising one's chin as an acknowledgement of another person. Significant in that it exposes the throat, long thought a point of vulnerability.
Phil greeted Fred with a wry grin and an up nod in silent greeting. See also jock nod.
Doctor Psychoによって 2014年09月06日(土)