To get overly excited or overly confident about something.

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.

Someone is getting a big dick when they try to prevent you from doing something you really want to do, when they get heavily angered/saddened at something small, or a mixture of both.