Who owns English?
How to propagate the change?
Is it legal to completely change a meaning of word in people's mind via internet and memes, without the permission of any authority?
If you want to change any societally owned thing, your only effective route is through persuasion and example.
With this hope, however, academies have been instituted, to guard the avenues of their languages, to retain fugitives, and repulse intruders; but their vigilance and activity have hitherto been vain; sounds are too volatile and subtle for legal restraints; to enchain syllables, and to lash the wind, are equally the undertakings of pride, unwilling to measure its desires by its strength.
Their's no authority, it's a living thing and changes all the time.