J.O.
Short for on my J. O. B. or on my grind, which means you're working and you're probably tired and your brain is mush
He said 'on my J. O. B.' and then fell asleep on the bus
She texted 'on my J. O. B.' and then J. O.-ed in the middle of it
He was on his J. O. B. and J. O.-ed so much he got a promotion