Boomer

Technically it’s an elderly woman/men but here in the modern days if you do stuff that an elder would do like not close the door completely, saying “back in my day” ect

Girl 1: bye

Girl 2: *doesn’t close the door completely*
Girl 1: ok boomer
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Grandchild 1: hi grandma!
Grandma: hey

Grandchild 2: hi boomer!