Schrödinger's Coulson is a thought experiment, sometimes described as a paradox, devised by Austrian physicist u/SunQuest in 2018. The scenario presents a Coulson that may be simultaneously both alive and dead, a state known as a quantum superposition, as a result of being linked to a random subatomic event that may or may not occur.
According to Schrödinger's Coulson, he is neither alive nor dead until the next season of Agents of SHIELD starts.