If you know about bull fighting then it’s probably about a charging bull ready to go at a red piece of fabric hold by a matador.
On this t-shirt you can see a different look at this as this time it’s not a bull but a power plug looking like a bull charing to a power socket that is made red and besides it someone drew a picture of a matador on the wall.
It sure seem to be less bloody then a real bull fight and that maybe better for anyone specially the bull.