Expressions used in Everyday Spoken English in Social and Professional contexts
Expression 'what's going down?' is an informal way of asking 'what is happening?' or 'what is going on?'. This is a predominantly American expression. In the past tense, you might ask 'what went down?' so you might ask 'what went down at the meeting yesterday?' or 'let me tell you what went down in the bar last night'. This is a casual expression but you can hear it in both social and professional environments.