1. when a person makes a statement that makes no sense, or is a pointless statement.
2. can also mean if a person is talking trash.
for definition 1-
person 1: i think climate change is a myth, and science is not real!
person 2: yo you steady chattin.
for definition 2-
person 1: bro you lookin mad ugly, and yo mom is bad asf!
person 2: yo you steady chattin.