Maybe come from “tit for tat”

所有跟帖： 

• But tater tots are yummy! Have u ever had it? -妖妖灵- ♀ (0 bytes) () 06/04/2024 postreply 15:55:50

• Yum yum! （another reduplication:)) -暖冬cool夏- ♀ (0 bytes) () 06/04/2024 postreply 21:37:01

• nod nod -移花接木- ♂ (0 bytes) () 06/05/2024 postreply 07:24:53

• But meaning is different:) -暖冬cool夏- ♀ (0 bytes) () 06/04/2024 postreply 17:54:05