Diaper duty 

having to babysitting an infant, who is too young, who is in the age that he don't know how to go to the bathroom,
and having to change diapers.

i can't go to the party i have to babysit my little brother, i will have t do this diaper duty for a while

Diaper duty by the martyr of the traitors February 3, 2018

diaper duty 

When your boyfriend/ girlfriend is an overgrown baby who thinks it's your duty to take their tantrums.

I'm gonna dump Joe. He's not a boyfriend, he's a diaper duty.

diaper duty by IreneAdler June 23, 2007