The character is literally just saying "Mum has told me several times" shortened down to "Mum's told me".
I'm sure these people know they're grasping at straws but they're doing it for two reasons.
1) To employ homo-narcissism and claim gay ownership of it as they do with all things people like.
2) To will/pressure/shame it into existence by pressuring the creators.
That's it, that's the entirety of it.
Sounds like their grapsing at straws. As someone else noted, it's probably just slang for Mom; why would both mums tell him something?
I'm sure these people know they're grasping at straws but they're doing it for two reasons.
1) To employ homo-narcissism and claim gay ownership of it as they do with all things people like.
2) To will/pressure/shame it into existence by pressuring the creators.