مَهْمَا means “whatever” or “no matter what” in this pattern.
مَهْمَا تَفْعَلْ أَفْعَلْ
Whatever you do, I will do.
مَهْمَا تَسْأَلْ أُجِبْكَ
Whatever you ask, I will answer you.
Both مَا and مَهْمَا can be rendered “whatever” here. Learn them as separate conditional openings; the whole sentence decides the best idiomatic translation.