Late at night, the speaker is caught between a messy emotional situation and the pressure of having to talk about it. A walk with their dad turns into an unwanted confession: they end up explaining everything about Parker, and the fear that he might never speak to them again. That forced openness leaves the speaker feeling raw, which may be why the poem starts with irritation at being around a parent at all.
Underneath the annoyance is real hope. The speaker wants Parker to come back, and says they have finally "made him a name," something they'd shout in the rain if he never hears it. That image is dramatic and a little desperate, but also tender. The ending pulls back to something smaller and more private: hiding in a closet, "fighting an internal war" against anxiety, and admitting their defenses "suck so far." The mood is anxious and vulnerable, with a touch of honest, teenage humor in that last line.