In the chorus of the 2012 song, "Birthday Song," the artist 2 Chainz raps, "They a' me what I do and who I do it for." Here, a' is an abbreviated version of aks or ask. Not all rap songs use this pronunciation, but it may be common where 2 Chainz is from in Atlanta. It's an example of linguistic drift in African-American Vernacular English (AAVE), and because that drift is so easily noticeable, it may indicate that AAVE is drifting quickly.