Why does she swear "on her mom" if her mom is dead?

Anonymous
When this girl was 3, her mom passed away. She says she thinks about her mom every day and wishes her mom was in her life. But when she hears something funny, she says "on my mom." As in, "I swear that's so funny." Why would she disrespect her mom like that?
Why does she swear "on her mom" if her mom is dead?
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