Actually this below absolute zero exists irl it's called negative kelvin or negative movement.
https://www.mpg.de/research/negative-absolute-temperature
It's more a name though, while comics probably mean this by how thy call it.
Actually, temperature T is not the fundamental statistical-mechanical quantity describing the 'hotness' or 'coldness' of a body. The quantity which is theoretically more natural is known as the 'thermodynamic beta' or, colloquially, the 'coldness'. Temperature is, then, just a derived quantity that is the inverse of coldness, i.e. T = 1/beta (apart from a constant factor).
Obviously, when the coldness (beta) approaches (+)infinity the absolute temperature T approaches zero. Thus, the absolute zero corresponds to INFINITE coldness and NO OTHER temperature is colder than that. Both the positive absolute temperatures AND negative absolute temperatures are much hotter than the absolute zero. The misconception that the negative absolute temperatures are somehow super-cold is just an artifact resulting from the inverse relation T = 1/beta. The 'coldest' temperature possible is the one with beta = infinity, i.e. T = 0. This temperature corresponds to the unique state in which the system is at its lowest possible energy state, where all the motion of its constituents has ceased as completely as possible, where its (3rd-law) entropy is zero, etc...
