Edgelord
Edgelord
[Cueball is talking to White Hat, who is balling his fist and has small lines above his head to indicate annoyance.] Cueball: So, I hear you're a real edgelord. White Hat: No!
[Caption below the frame:] How to annoy a graph theory Ph.D.

"Edgelord" is modern slang describing a brash provocateur on social media; often in a satirical way that if taken literally would be found disturbing or insensitive. The term derives from the word "edgy", which is used to describe things which are designed to be provocative. "Edgy" and "edgelord" are quite derogatory, carrying further implications of being style over substance, or only having appeal with rambunctious teenagers.
In mathematics, graph theory is the study of graphs, mathematical structures made up of nodes (points) which are connected by edges (or lines).
This comic plays on the fact that graphs have edges. Calling someone with a Graph Theory Ph.D. an 'edgelord' (a master of edges) is somewhat analogous to calling an engineering student a 'forcelord', an astronomy PhD a ' starlord ', or a pharmacologist a ' druglord '.
In reply, White Hat shouts "No", and is also clenching his fists in anger, which is ironic, because he seems to be on edge. Because "edgelord" is perceived as an insult by socially aware adults, Cueball is actually provoking White Hat, making Cueball an edgelord in this interaction.  Similar situational humor is also found in 2008: Irony Definition .
The title text makes the same joke, except that the title would be hyperedgelord instead of edgelord. A hypergraph is a generalization of a graph in which each edge may have more than two endpoints. The term "hyper edge" could easily be considered stereotypically "edgy."
[Cueball is talking to White Hat, who is balling his fist and has small lines above his head to indicate annoyance.] Cueball: So, I hear you're a real edgelord. White Hat: No!
[Caption below the frame:] How to annoy a graph theory Ph.D.
