«أَنَا مَا بَارِيدُهْ وِابْنِي يمِد إِيدُهْ»

The saying targets someone who makes a show of refusing something, openly disclaiming any wish for it, while letting his son reach out and take it on his behalf.

Its point is that the refusal is only a performance: the desired thing still ends up within the speaker's own household, so his claimed restraint costs him nothing and hides an indirect way of getting it.

Use it critically when someone professes disinterest in something but has his son take possession of it instead, preserving an appearance of refusal while still gaining the object.