Usher's ex-wife, Tameka, wants a judge to punish him for being a lousy dad who does whatever the hell he pleases with their kids and makes her life a living hell ... this according to court documents she's filed in Georgia.
The problem ... she says ... back in July, Usher stormed out of a co-parenting class they were ordered to attend ... and he hasn't been back since. She says she's begged him to return -- but so far, he's just ignored her.
Usher has primary custody of their two sons ... but she says he's supposed to make important family decisions with her -- especially decisions about schooling, travel and activities.
Tameka says ... he's shut her out. She never knows where he takes the boys or what he's doing with them. She's especially pissed that he signed up one of the boys for football practice -- without her approval.
She wants a judge to hold Usher in contempt and order him to be a better co-parent.
We tried reaching Usher, but no luck.