simile
Explanation
The Joke
The comic presents a "Conversation Pro-Tip" claiming that similes sound classier than metaphors. It then demonstrates this through a series of escalating comparisons. "Not classy" examples use metaphors: "That guy's a dick." The "super classy" simile version is: "That guy is like a dick." Then "not classy" uses "My life is hell," while the "incredibly classy" simile version becomes "I live in a place like hell." The final pair delivers the punchline: the "not classy" metaphor is "Todd's a cocksucker," and the supposedly "the soul of a gentleman" simile version is "Todd's mouth is as big as balls are."
The comic is poking fun at the grammatical distinction between similes (comparisons using "like" or "as") and metaphors (direct comparisons). The supposed "pro-tip" is entirely wrong -- adding "like" or "as" to vulgar statements does not make them classier at all. In fact, the simile versions are often more verbose and awkward while being equally crude.
The Humor
The escalating absurdity is the engine of the humor. Each pair of examples gets progressively more vulgar, and the simile versions become increasingly tortured and ridiculous in their attempts to rephrase crude metaphors. The final panel, where a man in a bow tie and monocle delivers an elaborate anatomical simile while being described as "the soul of a gentleman," is the perfect capstone -- the formal attire contrasts hilariously with the obscene content. The comic also satirizes the kind of dubious linguistic advice found in writing guides and social media tips, where superficial rules are presented as wisdom.