"I accept your respect Juma."
It is only said in response to Shikamoo. So a child would say Shikamoo to the parent and the response would be Marahaba. Same can apply for child to grandparent, student to teacher etc. Anyone who you want to be respectful to (and who is older than you).
This translation makes it sound a bit strange but admittedly it is hard to translate as there isn't an equivalent in English.