There have been several theories tossed around, from a brother and sister murdering their abusive father, to sexual abuse, to loss of virginity, to drug use. What do you think it's about?
Here are the lyrics:
green, green thunder and the loud, loud rain lead our woes asunder neath the proud, proud veins of trains let bleed the gunmen of our pumping earthly hearts wean or joys and plunder peel our shining teeth bid our hold on happiness
beat weighty tests with lofty cries lofty cries with trembling thighs weepy chests with weepy sighs weepy skin with trembling thighs
you must be hovering over yourself watching us drip on each other's sides dear brother collect all the liquids off of the floor use your oily fingers make a paste let it form
let it seep through your sockets and ears into your precious ruptured skull let it seep let it keep you from us patiently heal you patiently unreel you