Lyric discussion by Honenheim 

Cover art for Hay Loft lyrics by Mother Mother

It could be a story of two rural lovers that just happened to venture into the artist's head. It's plausible.

It could also have more hidden meaning, to either suggest difficulties in a parental relationship, or difficulties in a romantic relationship, where the dad really becomes a synecdoche to portray a large unknown force that is approaching to, one way or another, roflstomp on the young love :P

Regardless of either, the song's still fantastic.

Song Meaning