It means to swear everything on your mom (bird) and to let your fam (cuz) know your serious.
"On my bird fam we out here getting this paper, you dig!?!"
The best fortnite player on nintendo switch. add me kid (bird w keys)
bird: Get clapped you fuc face.
7 year old: im calling epic games.
bird: its called getting Bird Fam
bird: alr kid
11 year olds: your still trash boi