onamatically

When something turns on automatically e.g. a motion sensor light

Antonym: Offamatically

Yo! Let's bounce, the porch light on this crib just went onamatically

onamatically by HPom September 3, 2016

offamatically 

When an object turns off automatically e.g. when you set your TV to go off to help you fall asleep

Antonym: Onamatically

I really wish my TV would just turn offamatically so I don't have to get off my lazy ass or find the GD remote!

offamatically by HPom September 3, 2016