Mother (Karin) and daughter (Mari) are facing the demise of Mamma, Karin's mother and Mari's grandmother. They both release their pain on each other, but in unconditional love, everything is allowed. On the backdrop of mother and daughter seeking closeness and mutual understanding, there are bits of archive footage of Mamma, showing her peaceful healthy everyday life. Mo Mamma is a bittersweet homage to Mamma, full of feminine absurd.