When you host a cookout or family reunion at your household, and your younger cousins want to play with your electronics but you don't want them too, but they do anyway since either your dad or their dad don't care since it's either "ThEiR mY NEpHeWS" or "ThEiR mY KiDS".
"Hey, Did you get cousinzoned last week at the cookout?" - "Yup, unfortunately"