"Maa fere fun Orisa" is a Yoruba-sentence meaning "I will give my profit/gain/reward/praise to Orisha". This refers to the act of making sacrifice, "ebo", and that a part of what the Orisha gives to you should also be returned to them, to be thankful and praise them. It talks about the relationship one is mantaining to the Orisha. It is a very common expression in the Cuban Lukumí diaspora and available as a T-shirt in many Orisha-colors.
Order "Maaferefun" at the shop close to you!