The exact “first” origin of the “why is he lying” meme is hard to pin down. That’s common for modern internet phrases. They emerge from older formats: the image macro, the sarcastic caption, and the screenshot with a comment that turns into a repeatable template.
The phrase itself fits an older pattern of internet humor: when someone’s explanation seems inconsistent, the audience frames it as a question. Memes turn that question into a standardized caption, so people can post it quickly without writing a full critique.
It also catches on because it’s easy to spot. Many viral clips include built-in contradictions: someone says “I didn’t do that,” but the evidence contradicts them; someone claims “nobody knew,” but others clearly did; or someone insists “this is the truth,” while the video language—body cues, timing, or wording—signals otherwise.