I disagree. I can't imagine anyone saying or writing this.T.D-K said:To black out can mean suppress. So to black out one's emotions means to suppress emotions.
That's quite a specific meaning of "black out" that in my opinion cannot be extended to emotions.to black out (trans. and intr.), to extinguish or obscure (lights), esp. during a stage performance, or as a precaution against air-raids; also intr. of lights, etc.: to be so extinguished or obscured. Also in extended uses.