This shirt continues the odd use of the hashtag #
The shirt's...'slogan' is #Boomtime , to try and capitalize on the internet trend/fad/over-used thing of adding a hashtag to anything and everything regardless of appropriate or not. Maybe it's ironically used here? Either way, it has forward running/punch CG Boom Sonic above the slogan on the mottled gray tee. You can see the stamped-in logo in the back.
This shirt is for little kids only. It says kids about 3 to 7 are who it's sized for. (notice its proportions as well) Where is this sold? This is a fall 2016 item.