My City Now refers to an image macro, exploitable, reaction image and catchprase derived from a panel of Meduka Meguca, a crowd-sourced retelling of the anime Puella Magi Madoka Magica, which began on the 4chan /a/ imageboard in 2011.
The image has since spread out of context as a general reaction image, catchphrase and social media tag meant to signify that someone is alone or intends to take over a space.