Lying on your resume is an explicit attempt to deceive a prospective employer.
Lying on Github (and then presumably not using it on an actual job application), you're only fooling those who are willing to be fooled.
If someone is going to scrape data off the web about people and evaluate it for prospective candidates, the burden of separating the signal from the noise is on them, the internet is full of bullshit. You're obviously mucking with their process, but you didn't ask to be included in it either. No different than assuming all the content on blogs isn't plagiarized and then trying to use that to proposition people to be authors.
Oh, I think plagiarism is less ethical than lying on one's resume. ;) Unless, of course, it is done by a fictional character as part of poking fun at people who insist on reading other people's personality traits from their Github accounts.
Because, to the extent that this amusing exercise has a point, it is that your Github account is not a resume; it may just be a miscellaneous collection of code that you find useful, none of which is necessarily yours. And there's nothing wrong with that. That's Github's design. You should feel free to use Github as a tool, not as an advertisement for yourself.
And if you insist on pretending that the contents of someone's Github account, bookshelf, or sock drawer is necessarily some kind of representative sample of their character or skill, you deserve to get punked. A person who is lying on their resume has set out to lie to you. A person with a nonrepresentative Github repo is merely guilty of misleading the stranger who is looking over their shoulder.
Don't advertise something as something it is not just to steal the positive press and image of other people's hard work.