That awesome moment when you, and a stranger notice a female with a nice body, and give each other "the nod"

Solarpunk is a movement focused on a positive, ecological vision for a future where technology is used for human-centric and ecocentric purposes. It is a literary, artistic and aesthetic sub-genre and is also closely tied to eco-political activism. Solarpunk narratives have a distinctly positive and utopian foundation in contrast to the often dystopian visions found within other "punk" science fiction genres.

(N) : When a man nods in the general direction of another man. This can be an ambigious greeting often meaning “hello” or “whats up?”

A gesture of approval between two guys that believe the other is worthy of bro-hood. Usually between two people who have never met, but can also be used with someone who you don't have time to talk to.