To manage to say or communicate something while gasping for air. A noun or pronoun can be used between "pant" and "out." He managed to pant out his name before collapsing in a heap. He ran over here and start panting something about a robbery out as he tried to catch his breath.
pant something out
to tell something while panting for breath. Laura had been running but she was able to pant the name of the injured person out. She panted out the name.