There are several theories regarding the origin of the word tango, none of which has been proven. An African culture is often credited as the creator of this word; in particular, it is theorized that the word derives from the Yoruba word shangó, which refers to Shango, the God of Thunder in traditional Yoruba religion. This theory suggests that the word shangó was morphed through the dilution of the Nigerian language once it reached South America via slave trade. According to an alternative theory, tango is derived from the Spanish word for drum, tambor. This word was then mispronounced by Buenos Aires' lower-class inhabitants to become tambo, ultimately resulting in the common tango. It is also sometimes theorized that the word is derived from the Portuguese word tanger, which means to play a musical instrument. Another Portuguese word, tangomão, a combination of the verb tanger (to touch) with the noun mão (hand) meaning to play a musical instrument with one's hands, has been suggested as the etymon of tango.